I thought of something else. (my brain works in super-slo-mo!) My friend was going to spend a lot of $$$ to put in a new cam, lifters, manifold, and carb on his 350 powered '31 F@%& coupe because he says "it doesn't have enough power"! Well, we got to looking at his throttle linkage and found out that when his foot was on the floorboards the throttle plates were only about 3/4 open. We adjusted the linkage and he's as happy as a clam now.
Little stuff like that can make a big difference in performance.
