Ported Heads, edelbrock intake manifold (ported if necessary), cam, valvetrain, keep the holley carb, headers & exhaust if you haven't done so already, maybe a stall converter if it's an auto, gears and posi if you dont have those already...

 

Well i already have gears. And my engine has to be pulled because theres a tapping noise internaly and everyone thinks one of my cams has worn down because that would explain why my lifters alwyas have to be adjusted. So were our garage is pulling it out and were going to put more agressive cam into it. And i found out that i already had aluminum heads and a hell of alot of money into my engine about $8000 worth. My carburator was just set up so that it ran a lot slower. My secondaries would kick in really late or something?

 

You can also try Summit Racing. They have a whole top end kit from Trick Flow that's good for 500hp for around 2g's. Maybe that will work for you but get that bottom end checked and make sure it's ok. Good luck.