I wouldn't come to this site for anything other than basic Z32 stuff. Nobody knows anything beyond that it seems. We have several cars running E85 here in Utah. We just tuned a local supra guy to 751rwhp on E85, no detonation. He has 1000cc injectors and they were pretty much maxed so your 1600cc's along with 2 fuel pumps would be plenty sufficient. We also have a DSM that put down over 700awhp at 34psi on E85. He has been running E85 with a stock walbro for over 6 months with no issues and has trapped 145 here in Utah. We have had nothing but success running E85 here.