Ive built several motors for muscle cars but not one for a truck like my Burb. It has 255K on the clock and runs great but the motors getting tired. I have some questions: I have been told the heads I have are horrible and called swirl port heads and flow terribly? Is this true? If so what is the fix? New SS vavles and some mild porting or replace the heads all together? I dont know a damn thing about the computers on my year of truck is there any reason I should fear putting in a more aggressive cam than the weenie cam that came stock in the truck. Anyone familiar with a 93 ish year small bock GM truck knows is does OK towing but passing gear from anything above 50 mph is non existent and almost dangerous...this because the stock weenie cam producing a whopping 200hp stock and a mere 275ish ft lb. Just jumping up to lets say 214/223 duration at .050 with a mild .450 ish lift on 112 LSA I think I can work out an additional 40-60 hp and about 25-35 motor ft lb. Any insight or suggestions to rebuiding this motor and keeping it efficient yet produce some more power is appretiated. Recomendations on oil pumps, pistons, rings, timing chains, push rods, rocker arms etc are all appretiated. Thanks gentlemen.