Turbo EFI 318 Finally Running

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I'm tuning in on 91 right now (91 is premium at altitude). This is where I believe i fucked up a little; I put in a -6 AN pressure and return line. I am unsure if running E85 or a E45 mix of premium and E85 is even possible. I have plenty of injector flow to work with but I dunno about pressure and volume. In hindsight I would have made it -8 AN pump to rail. So for now it's 91 and making it very rich when at power. I did make a 4 gallon water/meth tank so If I feel the itch for more power I will buy a pump and injector kit and cool it down that way.

Been having issues with MS2 lately so it's been slow progress. Tunerstudio wants to suddenly go offline when connected to MS2 and engine running. Making it difficult to tune. I'm very rich at idle, and1300 rpm. I must have some idle air control settings wrong. And idle afr is 12.7:1
So I have some work to do and lots of reading with Megasquirt. I deployed overseas and have forgotten just about everything when i came back.
I'm building mine for E85, but blow thru and I did run -8AN round-trip, but wanted some scale if I build a stout motor and decide to really turn up the pressure.

Given that you are only shooting for 400hp, you may be able to get by with E85 and your -6AN plumbing. I bet you would be fine. E85 needs ~30% more volume.

Eager to hear how your MS2 setup works out. I want to eventually FI mine as well.

Best of luck!