I got a 67 327cu it currently has a Holley 600 4bbl vaccum secondary.I just got the car a few months ago and everything was already done so I don't have x-act spec but..It has a pretty radical cam,holley intake,HEI.ignition,newer GM heads(for fuel reasons),headers.Here's the argument half say get a 750cfm double pump,then the other half say get a Edelbrock Performer 600cfm machanical secondary.The ones that say get the 750 say the 600 will never feed it enough fuelat high RPM'S,the one that say go with the 600 say the 750 will drown it out.Myself I'm more of a TPI man,I know little about carbs as far as what size I need to please this motor.So I thought I'd let some of you guys put in your .02 Sorry about the lack of specs on cam and heads but.I didn't put them on

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

I'd say either a Holley 750 vacuum secondaries or DP....thats kind of a tough call on a motor like that. Forget the Edelcrap completely.

What cam do you have in there?

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

Don't have specs on cam.All I can tell you is it sounds very lumpy.The higher the RPM'S the harder it seems to pulls.

 

On a big cammed, fast revving motor like that..I'd say go with a 750 DP.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

I would personaly not go with a 750dp a 650dp would work great or a larger cfm vac secondary carb would work great also. Leave the 750dp for a built 350 or BB.
SSC

 

I would go with 650 or 700... 750 if you really don't care about mileage... I have had absolutely no problem with Edelbrock... The carb just bolted in and hasn't needed adjustment since... the only thing that bugs me is that I can't hook up the charcoal canister... I'm gonna be putting on a vette carb anyhow, quadrajets, edelbrocks, demon and holley are all good... just don't buy new q-jets, thats what ebay is for...

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1984 Firebird - Daily driver, 305 LG4, T5 - Hurst short shifter, Edelbrock 600 CFM Performer Carb - Edelbrock Pro-Flow air filter, gutted cat, IROC 16x8 Wheels, Goodyear P215/60/R16, AIWA bargain basement (from Sears of course) CD player, Fuzzy dice, Eight-ball shift ****
Check out my ride here $1600!!

First Kill: 2001 Subaru Impreza WRX Wagon (1 person vs me with 2 passengers)

 

Thanks for all of your advse and opinions I well think on it a bit.I talked to a buddy the other nite turns out he has an Edelbrock 600 and a Holley 750 both DP and said I was welcome to try both out To see what works out best

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,