Eddy head question

If your pistons are at zero deck, and you use the closed chambered heads you will not only gain hp from the larger valves, you will also gain hp because you will have perfect quench if you use the felpro .045 head gasket. If your pistons are at true zero deck with the 63cc heads you should be over 10.50 to 1 compression. Did you verify zero deck or is the piston still in the hole? Most of the Time you have to deck the block to get a true zero deck. I think if you have everything setup right you should gain quite a bit of hp switching the heads.