I have 305 with holley projection, high rise dual plane intake, and headers. I am looking to buy new heads. I have heard that 350 heads will work and some say they wont. will they? I would love vortec's but would rather stay with the older bolt pattern. I am not looking to spend a ton but plan to upgrade to a 350 eventually and want some more ponies for the 305 until next summer when the rest of the engine gets replaced. Also, what compression would be optimal? I know if I get aluminum i can go with about a point higher on the compression ratio.