I think a lot of racers and want to be racers and want to be HP engine builders don't realize that the race car has to have all GOOD parts from the front bumper to the rear bumper to outrun all other cars and racers in the same class, HUH Al ,Thumper and many other good racers on here
I used to help a couple race a NHRA Hemi stocker back in the early 1970s, we had bought an Art Carr "8 inch" drag race converter from him, that thing was absolute JUNK I took it back to him many times to fix it before giving up on it and finally bough good a Turbo Action "J" converter I learn years later that Art had bought out a decent commercial and race converter company (Hawaii racing) in SO CA that had moved their machines and good inventory back to Hawaii where the owner was from
We found out the hard way about buying and using known good race parts
That being said both engine and chassis dyno should be used as a tuning tool to help you learn how to work on and go faster with your toys: