Some thing you need to know about piston to head clearances are that the piston to cylinder wall clearances can add to the deck height of the piston when it rocks over after firing and reaching TDC My message is the center of the piston may be .010 down from the deck but what are the outer edge doing when it is running
I've seen from .003 to .012 height differences due to the piston to wall clearances on the outer edge of the pistons
.042 has worked well for me, .035 piston to head clearances was hitting on both sides of the pistons in my old pump gas six pack stroker motor .042 didn't
that motor ended up with 10.78 to 1 compression and had no issues on Oregon 91 octane pump swill with 10% ethanol in it
My cam was much bigger than yours though, 260 degrees at .050 intake side with 266 @ .050 on the exhaust with 108 LSA installed at 106 intake lobe centers