Other How far can you run the piston out if the deck of cylinder

[L.T.D]

I'm putting together a STD stroke 62t case with R&d cylinders and seadoo 951 pistons. When I was checking things over I noticed the pistons pop out of the deck so I was taking different thickness gaskets and checking the port timing with a .030 gasket I can get the ex to open at 86* and the intake to open at 120* and the piston sticks out of the deck .070. From the top of piston to the top of the ring is .165I know I'll hafta cut the domes at the right angle to get squish correct but is it safe to run them out that far or do I need a thicker gasket. Also what is the max you can get away with would like to get the timing lower