Ok, without kicking off a debate over whether the 305 is even worth improving or not, I'm looking for advice on the best heads. Not new heads, but instead, what casting numbers or motors should I be looking for while crawing the junk yards and the swap meets. There's gotta be something better than stock, to keep my eyes open for. The motor's been bored 40 over, and has a mild cam (204/214 at .050 dur.) with a dual plane intake.