Power is money sir. What is your budget?
If you don't have GM L31 Vortec heads, this is a great addition for low bucks. You may already have them if yours is a truck motor. You will want to change the cam in the rebuild anyway. So if you are willing to spring $450 for the heads, $200 for the intake and $150 for rocker arms on top of the rebuild cost, you can have 325hp motor pretty easily. Spend another $300 for a stroker crank and you could be in the high 350 to 380 hp range with a top tune.