Edelbrock / RHS heads, or go BIG block and put it to bed!

It's apples and oranges when talking aluminum or iron heads. Do you know the chamber size of the heads you have now? How deep are the pistons in the block? If you really have 9.5:1 compression, you NEED iron heads. Or go with Eddys an a set of pistons at zero deck. Either way, they're closed chamber heads an must have proper quench to perform well.