One has only to look at the intake port configuration of the cylinder head to understand Jerry's and Jon G's comment that 2 carbs is either 1 too many or 1 too few.
Two carbs may add "eye candy" to the uninformed, but unless done perfectly (selection, calibration, synchronization, etc.) two carbs may actually LOSE power!
If three carbs are used, they must be matched, and the three carbs should each be smaller than the stock single barrel carb. Carter type W-0's would be my choice; others may prefer Autolite 1100's, (Ford 144 CID engines) or Rochester type H (Corvair). Others (hi Jerry) might prefer motorcycle carbs. I have some personal experience with using slide Mikuni's on a performance engine; after 1/2 a season, they were totally worn out!
With all due respect to both Jerry and Jon G. (the old cliche about agree to disagree), at age 78 I am not old enough to need an automatic choke
and I really prefer the performance of the manual choke. While the choice is yours, DON'T use the auto choke IF you modify the engine; you won't be happy with stalling at stop signs
Use of a "big" camshaft moves the engine efficiency curve to the right. More power at higher RPM's, less power at lower RPM's; and higher fuel useage across the entire RPM range. I have modified a number of non-Chevy engines for street use, and ALL of them exhibited these characteristics.
Jon
