What is a good sized carburetor for and 350 or 383? 750 CFM?

 

You probably haven't received any responses because your question is too open-ended. Really need to know more about the combination like cam, heads, intake, exhaust, transmission, use, etc.

For a low-RPM torquing 350, a 600 would be fine. Chevy uses a 750 Holley to rate their ZZ4 at 355 HP. 383's would use a slightly larger carb, but certainly nothing like an 850 unless the RPMs are sky-high.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, WP 305 heads ported & polished, Hooker headers & y-pipe, hi-flow cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

Look at www.demoncarbs.com and check their recommendations for carb vs. motor. I think a 750 is what they would pick.

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"So many Mustangs, so little time..."
ICON Motorsports

 

My 383 worked great with a Speed Demon 850 but I was also shifting at 6500 rpm. The 850's now on the big block and it may not be enough. It really depends on your combination of parts.

I've also seen an Altered dragster with a 377 engine and a 650cfm carb run mid 9's.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley