1972 GMC pick up truck long wheelbase. 308 rear gear, 350 turbo transmission with a shift kit, and a 1900 stall. The engine is a 350 with flat top pistons, 272/454 cam, Holley contender intake, 650 Holley carb. I have a K&N air filter, and headers. I really don't like the sound I get out of this engine. I know I like the 280/480 comp sound. I want this truck to go a little faster too. I'm gettining 373 gears. If I put a 280/480 cam in the engine will this work to make the truck faster, and sound better. Any ideas would be appreciated.