Hi all, I have two sets of heads. One is off a 69 truck casting#c8ae h and another from a 67 galaxie? d2teaa is one of these different than the other in cc's or port size or jacket thickness? also does anyone know the stock distance from rod pin to comp deck on the 73 390, one of these sets of heads will land on this block. What is the thought out here about speed pro pistons? Thanks fellas, sorry for the 20 q's