vu should be the ls1 10.1:1 comp, i think the only way you could do it is to put dished pistons in, as shaving the heads will increase your compression ratio as your making the combustion chamber smaller in the way of the chamber/bowl on the heads becomes smaller increasing the comp.
could put in a thicker head gasket, i know not ideal but would need to go to a .060-0.065" thick head gasket with standard head chambers, could still how ever do bigger valves and increased port flow without shaving the heads. could increase the bowl chamber size as well i think by machining/increasing the bowl diameter on the heads, which would help drop the compression a little, maybe enough with a thicker headgasket(don't quote me on that i could be wrong on that part).