I have a bone stock 1980 vette with a SBC 350 and a 700R4 transmission. The car is slow as snow and i want to make it faster, but i dont want to piss off my wife and neighbors from the noise of a super loud engine. I have spoken to a local performance shop that said they could stroke the engine and get me up to 425-475 HP. I was curious about how much HP i can get out of a new cam, performance heads, holley 650 Carb and full length headers? Also would there be much of a difference in noise levels created by these 2 engines?