650 or 750 Edelbrock on 340

My point was the Edelbrock 1407 as manufactured is flawed. Its not fair to draw any conclusion about the design or whether the extra cfm/lower restriction is a demonstrateable advantage or disadvantage.

If @Divenut wants to use the 750, then fix the flaws an it should be OK. Just looking at the build in the first post I'd say do a new baseline with the 650. Get the best mph and ET you can tune it to. Then go try something else. Less restriction should pick up some power - depending on fuel distribution etc. Tires weren't stated but I assume its close to peak power rpm at the finish. If after tuning for best et and mph their not both better than with the Carter 650, its time to figure out why. Maybe that engine doesn't have great fuel distribution. Maybe the intake velocity slows down too much. Anyway thats for later only if it doesn't work out.