I have a carter 600 right now,But i'm thinking of either getting a bigger carb or,Buying a strip kit and re-jetting the 600.If i go w/the bigger carb,What size would be appropiate? All my modifications are listed in my signature,I'm thinking that with everything that's been done,I should be able to run a bigger carb,or get more cfm's.Would something that flows 650 cfm's be to much?

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82 firebird with 305H.O.,Block bored .30 over,Keith black hyperutectic flat top pistons for 10 to 1 compression,Turned crank,Magnafluxed connecting rods,Melling H.V. oil pump,and double roller timeing chain,Ported and shaved heads w/3angle valve job,Z-28springs,Summit push rods and comp cams magnum roller rockers,Ported Edelbrock performer r.p.m.intake,Carter 625 afbcarb,Accell spark plugs,wires,and H.E.I.super coil,Heavy duty cap and rotor,Clevite performance cam with 450-460 inches of lift,Comp cams lifters,700r-4 tranny rebuilt with trans-go rebuild kit,corvette servo,New torQue converter,Flowtech headers,Flowmaster muffler,3.73limited slip rear end,Energy suspension bushings from front to rear,Energy suspension tranny mount,New center link,ball joints,trans-am steering box,Hopeing to run good times when i FINEALLY do get to the track!!

 

My suggestion is to keep the carb you have making sure it is tuned properly. A larger carb would probably increase horsepower by less than ten and decrease torque. Any gains from the bigger carb would appear above 5000 RPM and in my opinion not be worth it. If you have money to throw away, try the Road Demon, looks like these are the best. I think 650 cfm would be the largest you want to go.

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350 Vortec, forged flat-tops, CompCams XE268, Edlebrock RPM, Holley 3310, TH350 w/Holeshot 2400, 3.23 posi, Heddman shorties, HEI

 

I agree 650 is about the largest you would want to go on a 305. Carters are good carbs, make sure its tuned up and you should be very happy with it.