Big horsepower 318 builds

I have an older comp eliminator engine I race. I would consider it a big horsepower 318 deal only a little smaller. It's 312 cubic inches, makes 725 hp @ 9200rpms. 4.0" bore 3.0" stroke Arrington heads, single 850 holley when I got it. Ran 8.50-8.60s @2250lbs. It has a tunnel ram with 2 fours now and I'm at 3000lbs trying to get it back in the 8s. It's pretty much a max effort engine, just a little outdated. It's all in the whole combination, not just one part that makes a car run.