Ebay GT45 + 5.9 Magnum + E85 blow thru

This particular model is supposed to support up to 1200hp. With E85, it's about 30% less. And I don't have enough fuel pump volume to get anywhere close to that. My goal is around 500hp with my setup but I'll have room to grow should I choose. I'm still working through some bugs. Starts on first crank, but idle and off idles is terrible until I get up to 180F.