Originally Posted by whipplem104

You might prove me wrong on this but most likely you are going to end up with a big pile of broken parts. The 3.6 engines have the wrist pin moved up into the oil ring land to get the piston height correct and keep the rod ratio correct. The crank is machined and the pistons are cut for clearance.
If you mill the top of the pistons that much and add 1bar of boost then they will fail.
You could go with a copper headgasket but as mentioned to do this and get the compression ratio where you want it then you are going to have to go a lot. You would have to mill the cam sprockets to make them adjustable for getting the timing correct. It is possible that you could retard them one tooth and be close enough.
As far as what compression ratio to go with as Stretch mentioned you can go with those formulas. That is a good indicator for running pump gas. But remember that the higher the compression the lower the boost needs to be to make hp. You should not have as much trouble with knock on this project due to the fact that the boost is linear. So you are not making big boost at low rpms. It also depends on intake temps, timing, quench, etc.