Your motor is probably around 200hp if it still has compression. Dont bother with ported heads, the castings likely on your engine are limited. Buy some s/r heads or something like and a 270-280 /.470 camshaft and some headers. This will give 300-350hp and have some torque to move the weight of that truck. Going bigger with a lopey cam will mis-match your car combo. Good luck...