I've built plenty of engines before and I'm generally pretty good at estimating the power that they will make. But I don't know anything about the 305. I'd like to keep the original motor, which is a 305 in the car and get about 320 horsepower. I know with a 350 I could get that with just mild parts, but what about the 305? How achievable is that? How achievable is that if at all with stock heads?