If you have combustion gas in the coolant, and you still have antifreeze in the motor, be advised, if antifreeze gets into the oil, it will take out rod and main bearings and kill a crankshaft in pretty short order.

When you did your compression test, did you do it with all the plugs out, or did you just test each cylinder individually? A cylinder with a blown head gasket can, and will show a higher then it really is, if it can use some of the compression from the cylinder next to it that still has a spark plug in it. Gene