My heads were milled-effect on compression ratio?

The original shims were about .022" IIRC.... Permatorques are around .051" so you are pretty much dead even.

If you used Mr Gasket 1121G's at around .028" thickness, then you will have eliminated approximately a bit over 4 cc's of chamber volume. Not sure what engine you have, but if a 340 or 360, that would gain somewhere around 0.4 points in static CR.