[KingLT1]

LT4's have made right around 800whp on 93 octane with heads/cam/ported supercharger. Andrew @ CSP did a couple years ago. That being said since you lowered the compression I would think you could run 15psi on 93 octane and be ok. You are not really much different then a LT4 at this point with the lower compression forged pistons. Your dynamic compression is much lower as well with the cam.

In this case you can likely make as more power on 93 compared to E85 because you have greatly reduced dynamic compression which raises the octane wall. E85 would make more power all else equal but you will run out of fuel system on your current setup before you get to that point.