I am using 11" Wilwood discs with 4 piston calipers in the back. The shot showing the drum looking actuator is just the Wilwood emergency brake assembly that will be inside the disc hat on the rear.

I don't have a specific horsepower goal yet. I am shooting for 1,000+ on pump gas. I think that should be achievable with a relatively reliable build. I think I can hit between 1,250 and 1,500 running race gas and higher boost levels, but I am not sure about that yet. I know it could be done building it as an all out race motor, but I want to build the thing so that I can drive 300 miles, change tires, run it at a track, and drive it home without lifting the hood.