Honestly with that as a max, i'd look at using a V (or ZL1) module and replace the pumps with DW300C pumps. Get a vaporworx controller to control it all and let him know you're using those pumps. I think that would get you VERY close to 750rwhp and maybe even on E85.
https://www.deatschwerks.com/blog/ne...-fuel-pump-kit