Potential twin turbo build, looking for injection advise

Sounds like you have a reasonable plan and expectations. I think the Tanksinc setup is a great idea. A little pricey but do it once and your done. I'm still working through the bugs with my Fitech, but I'm a novice at this and the whole E85 thing is not well documented, so I'm on my own. If I was to do it over again, I would go Megasquirt and MPI. Better support, more flexibility, but more expensive. The fuel supply side of a turbo setup and any EFI gets pricey quick. I started with a home brew E85 Holley DP750 but went crazy trying to tune it.