273 rev monster combos

Sounds like you've got the pieces for a good combo already. Headers help as does a free flowing exhaust. Porting and gasket matching the heads helps also. If you're planning a rebuild make sure you put around 10.0-1 compression pistons in. Flatlander racing appears to have them available although I haven't contacted them yet. Your cam isn't too big which is good. 273's don't have loads of torque and a cam with too much duration (270-300) will just kill the bottom end. Carb is good too. A 600 or 650 works just fine. Look through the engine section of our forums. there's lots of posts about the mighty 273. Good luck and have fun!!
toolmanmike