Alex asked for a 40 HP reduction so I assume the SC Shelby is in the books? If so, what is it rated at? I'd love to see one of those in Stock. The standard issue 306 HP Shelby needs a big drop in factored HP also. Shooting' from the hip, I'm guessing about 260-265 would be about right. I'll bet there's some sort of service replacement cam that's considerably larger also?
Go for it Alex!