Higher compession supercharged V8

[gluon]

I am building a 6-71 blown 402 inch (4"x4") aluminum small block. With a water/air intercooler so i should end up with 12psi of cool boost. I want to run a good amount of straight water controlled by the load reading on my efi computer.

What compression can i get away with? 10:1? Flowrates? I have no experience with water injection.