your cam should match the rpm range recommended on the heads, and your pistons should match the recommended compression ratio assuming this will be naturally aspirated as well as all other components. You may also want to zero deck the block to help get your self to the recommended cr. I'm guessing 12-13 to 1 cr this means you'll use a domed piston
look for a compression ratio calculator online they are easy to find this will help you get to your desired cr