Well if you want to use forced induction you will have to build it deffiently, ie: cam choice, cr, pistons, etc...
If your'r going to stay n/a then i'd get a good set of aluminum heads. I'm not sure what heads you have on there now and what size combustion chambers they have, so i cant suggest some. But difinitely aluminum, save weight too. If you can get the head casting numbers then i could tell you what heads would be good.
If you want to make serious power then you will need a decent sized cam. Would you want to keep the stock converter or would using a higher stall one be something you'd want?
One thing i can tell you for sure is that you will need a new intake and carb. The performer is best on stock engines. For performance you'll want to look into a performer rpm. The 650 carb won't be enough. You'll need a 750. I'd stay vaccum secondaries for the street.
You'll need headers and dual 2.5” exhaust with good flowing mufflers if you dont have that already. And h pipe would be a good idea too. For mufflers, i like thrush. Their turbo muffler sounds real nice, a little quiet for my taste though. Their 2 chamber sounds awsome with a big cam, not too loud, but you will definitely be heard.