My stealths from 2012 were 79-82 CC out of the box. This should be worth around half a point of compression depending on the exact specs of your engine if you run a steel shim gasket. If you run a standard .039 gasket it will only be worth around a quarter of a point. A .016 cut on the Stealths will get them down to the 75 CC range, which will get you about 1 full point with a steel shim and around 3/4 of a point with a .039 gasket.

I run Mr Gasket steel shims with my stealths and have not had a problem. Make sure you look closely that the gasket doesn't overhang the chambers no matter which gasket you run if you run a 4.41 bore gasket.

Measure how far in the bore your pistons are with a straight edge and some feeler gauges and you can calculate more precisely where you should be. I'm assuming you're about .140 below deck and 8:1 stock with a 90 CC chamber.