It is depend how much you will put under sleeve shims. great amount will kill bottom end completely-engine will be for speed only ( realy fast on the end of long straight) but it will be realy slow on bottom end. I have tryed to raise sleeve on 21 Nova by 0.5 mm ( all timing raised by 11.5 degree)-it was no good!!!!!! Don't go there, it will be very high speed engine with no bottom end at all.