i would use 8.5:1 but make sure they don't just mill the top of the piston to lower the compression, that is bad for a s/c car... you want as much material up there as you can get to help with the high heat... i might be able to get you a set of 8.5:1 if you are interested...

i am offically a troll... so take my information and advice with a grain of salt.

08/15/2001 - 11/05/2001 : 1999 Ford Contour SVT : 170fwhp - 147.9 fwtq
07/17/2001 - __/__/____ : 2001 Roush Mustang GT Stage 1
11/05/2001 - __/__/____ : 2001 Ford F-150 SVT Lightning