Boost is fun! Turn it up to what you feel comfortable with, long life and high boost can't be used in the same sentence with a stock block 302. They are tough little motors, keep the tune up safe and it'll last a good life. I ran 18psi with a turbo a few times through a stock block and it hung in there for the summer. Made right around 650hp at the crank. Blowers are definately harder on cranks and blocks then a turbo.