I couldn’t even start to imagine

If you're talking about a pure stock drag racing engine, they really don't cost much more than a stock rebuild. I've checked them out and you can't run a 3 angle valve job from what I understand but I could be wrong here
Gotta list of the rules somewhere?
Also, if you just do that inexpensive “Stock” rebuild, you’re never going to be competitive. Ever ever. Dream on with that! LMAO!!!