[AussieinNC]

Stock lower end with stock pistons, I use the basic rule of thumb for minimum clearances is 0.080 for the intake and 0.100 for exhaust. I usually clay test at least one cylinder on each bank.

Much more important with these engines is coil bind at max lift.....I assume you will be using new springs....

If you buy a roller cam, by the kit that also includes recommended springs and follow the installation instructions to the letter.