I have an R1 block W2 418" small block. It makes about 550-600HP NA and it is 10:1 compression and only runs on the finest E10 91 octane fuel.

For people that know more than me what would a cam change, ring gap change, and a turbo look like for this combo? 850HP on 10lbs? and what Turbo S475? I would probably go E85(actually E70 is available here at the pump) with no intercooler or meth injection just to make it easier to package. In my mind I think if I were to push it harder than that I would want to change pistons to something more fitted for boost, it has some auto tech pistons in it now and boost wasn't in the conversation when they were ordered.

I already have EFI and flex fuel capability. I believe I have enough fuel pump to cover 850-1000HP on E85, if not a 3rd pump isn't hard to add.

I would imagine I would also need to change converters.