Get meth and stick to factory CR.
You are fuel limited as long as you stick to 91. It is a lot easier to swap a pulley than it is a piston. 8.6:1 is fine. This is what the 5.4 CJs ran FWIW.
Also, I would stick to a smaller blower. A gen3 or 3.xx KB is going to be lazy at the boost...
Folks, I need some 18s on the back of my C6 ZR1. I was thinking of Forgeline but BC Forged has better designs IMO. This is what I had in mind in 19F/18R
Here are their mono designs. Any that I should consider? Car is inferno orange and I will go with...