Used them all and will say on stick 340 use the 750 dbl pump or the 3310. Pure street 650 Dbl pump or 600 vac sec. On carter side use a AVS not the AFB and spread bore on spread bore intake I used TQ and Rochesters they all have there advantages. The Holleys were always faster one ecception was a maxed out AVS that was close to 750 dbl pumper time wise, but the AVS with no choke was real pain to start outside on cold days. Holleys don't really need a choke to start even on cold days if car is tuned correctly