The S/C block off kit is to cover the opening of the S/C when you remove the snout and the rotors. Basically making an upper intake manifold. I'm going to be doing that with a gutted case.
I can look into LT1/LS1 MAF for it's use in my build.
I'm going to use 60's. E85 is not in my area, and besides I don't feel like I'll need it to make 370-400whp IMHO.