My computer is not opening excel files. Can some one run this set up through a dcr calculator?

I am looking at prc ls6 2.5 heads, .040 cometic, ms4, flycut pistons. I think with the heads milled .035 this would yeld 11.1 to 1 scr.

I am trying to see if I can get this set up close to 8.5 dcr.

Kind of a noob with the math. Thanks for the help.