Have to rebuild the carb that was on my mildly built 318, it ran great with the Holley list# 6619-1 which is an emissions carb 600cfm 4160. I also have a Holley 80457-3 which is a 4160 non emissions carb 600cfm.Both carbs are vacuum secondaries. Trying to decide which carb to rebuild, would I gain any performance from running the 80457-3?
The 318 is stock bottom end, pocket ported 302 heads, lunati voodoo cam 60403, Edelbrock performer intake, headers.