Get on Classracer.com register and use the classification guide that Dwight Southerland has there.
Use the 302 heads and the LD4B manifold they flow much better. Talk to other people running your combination.It will save you a lot of money. The Bushmakers have a very competitive 273 also Paul Wong. Unless you are building a killer car buying all those valves was a waste of money. Sorry to be so blunt. If on the other hand you just want to play on the flow bench you may learn something for the future.
Stock eliminator is a lot of fun and hard work. I have been doing it on and off since 1972 and set many records. Enjoy.