340 Stroker Build Need LOTS of Advice

If your using the felpro 1008 gasket...... many do..... works great...
Its 4.180, not 4.08, and thickness is 0.39

With a dished slug and eddies your going to come out just short of or around 10 to 1.
Nothing wrong with that for a driver at all. Will still make gobs of torque and horsepower.
My current motor in my car is a 360. Factory piston was 27 in the hole. Got it up to 10.4 compression running an 028 gasket and milling my eddies about 40 thou
Were i you, i would run the 1008 gasket and leave the heads uncut