318 head porting for the average joe

For me it is the interchangeability. Internal balance and the smaller engines will rev higher with the limits I place on my small block engines. 7,000 rpm redline, .500 inch lift, solid cam, duration under 284 degrees, single valve spring with positive seals, factory heads, factory exhaust manifolds, and run on 91 octane fuel. My cars are light early A bodies, and limited to how much rubber one can fit in a stock wheel well. I don't drag race so mpg and a higher top end is more important to me. They have to be completely streetable, go any where, any time, for as long as I want, and as fast as I want. 360's are fine for trucks, heavy cars and some one else. If I go past a 340 in a later A Body, I personally would go 383 big block.