I'll try not to forget anything, but as far as the engine and drivetrain goes, here is the culprit: L69 40 over 305 block- 416 heads- shaved .003, Manley 1.94/1.6 raceflow, manley guides, pocket port, full port in runners, exhaust polished, crane springs Cam- summit, 214/224, .442/.465 @ .050 1.6 roller rockers shorty headers- 1.5" Holley Street Dominator intake (old style) Edelbrock 650 AVS 700R4 w/ 2k stall 3.73 rear The car runs awesome- but it just falls flat at about 5k, but I know and feel she's got a LOT more in her. From what I've read, the version of the Holley Street Dominator that I have is a 'gas crunch era' model (model 300-28Z), with the rear cylinder crossover, that was only good to about 4200 rpm. I also would like to be able to retain my L69 dual snorkle set up, as well as my Edelbrock STB- I know that hood clearance is a concern w/ the OEM hood. So, all that being said, has anyone else ran into a similar issue, or have a similar setup to what I 'd like to run? Also, I haven't seen any info anywhere on the 2 intakes dyno tested side by side- any insight would be helpful. THANKS in advance!!

Sounds more like valve float or ignition dying than an intake problem.

Ignition is new- cap, rotor, Taylor Thundervolt wires, Accel Superhei, curve kit, etc,

Springs are what was MFR recomended- set to the correct installed height.

I should rephrase, it doesn't completely lay flat, it just doesn't pull like it should.

Part Number: SUM-1103
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-4,500
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 214 int./224 exh.
Advertised Intake Duration: 272
Advertised Exhaust Duration: 282
Advertised Duration: 272 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.442 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.465 in.

You need more cam.

Good enough, so I'll have to change out the cam.

Will I be able to use either of those intakes w/ the dual snorkle setup, as well as the STB?

The issue with a factory dual snorkel is the only carbs that will fit under it are q-jets, Performers, and single-inlet Holleys.

Yeah, my AVS fits fine w/ a 1/2" spacer. My concern is the overall height w/ a different intake.

I don't want to go to a cowl hood, and I'm concerned w/ the intake hoses being blocked off by the STB.

I haven't installed the STB just yet- I've loosely laid it in the bay for measurements, as well as drilled the cowl/firewall holes, but then I ran out of time.

Had a 350 with vortecs and that same cam. At the drags, best ET was when shifted at 5200rpm.

The new Airstrike manifold will make more power than that old Holley 300-Z junk. It alsow ha the vacuum fitting hole (#8 intake runner) in the right spot for a holley carb where the edelbrock rpm does not.

THANKS!!!

Did you have any issues w/ hood clearance?

I kind of wish that I'd of gone bigger with the cam, but I was worried about overcamming a 305.

I had this Crane cam in my 305 with the GMPP spreadbore intake (from a ZZ3/ZZ4) running the stock q-jet:

Part Number: CRN-113941
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,800-5,600
Intake Duration at 050 inch Lift: 216
Exhaust Duration at 050 inch Lift: 228
Duration at 050 inch Lift: 216 int./228 exh.
Advertised Intake Duration: 272
Advertised Exhaust Duration: 284
Advertised Duration: 272 int./284 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.454 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Valve Lift with Factory Rocker Arm Ratio: 0.454 int./0.480 exh. lift
Lobe Separation (degrees): 112

At the time they called it a Compucam 2050, now they call it a PowerMax.

It's not that much bigger than yours. I shifted 1-2 at 5500 and since the TH700 wouldn't shift 2-3 at WOT, went through the traps at 6200 RPMs. It was still pulling gamely, but wasn't really making more power. Although they say 1800-5600 RPM powerband, it didn't start pulling until 2500 (and my converter stalled at 2300 - a 200 RPM dead zone there).

No. I use a old 60's era corvette L-88 drop base air cleaner.
It hugs down around the carb a lot lower than typical aftermarket 14" air cleaners do. It's the lowest I've ever seen. Removing the choke horn on Holley carbs is recomended for best airflow with this air cleaner.

Did you mill it flush with the top of the carb-I'm prety sure that I can't mill mine down and retain my choke function- mine's an Edelbrock AVS though.

The edelbrock carb choke air horn is not as high as the holley.
Not so much an issue.