efi-diy,
tlowe's numbers are probably very close. You've got a pretty good, hot street cam there; and a good strong engine. But you'll have to do one of two things to get more horsepower out of that 292: either 1) go with a hotter cam and spin the engine higher plus add high compression pistons or 2) add a mild boost turbocharger.
First choice is easier; second is more work and involves careful consideration of other factors, but allows you to make more max horsepower without having to turn 5000+ rpms. You could probably get close to 300 hp with the proper boost with just the setup you have now. Your compression ratio is just about right for a mild turbocharger.
-magic mike-
