850 or 950 Carb

moper said
If a performance engine cannot eclipse 90% efficient, you're correct. Except most can. The longer strokes tend to easilly reach 112% at peak torque, and will carry that well past HP peak. So you are correct, but the 383 is a short stroke. You could also use the percentage of stroke increase and multiply the carb choice the general "rules" say. 750x 120%=900.

I just used 90% as a good number for most engines and a 7,000RPM redline since none was listed. At or slightly above 100% an 850 would be perfect. Have you seen one over 100% without forced induction? I know a supercharged engine can top out at 112% to 115% but N/A can as well?