Cam Button how to.....next question: how to measure cam endplay?

ok, got the cam installed and degreed in. Btw, between the crank, the gearset and the cam there was a 5° difference to the intake centerline it should have.....now another question: how to check endplay with the stock timing chain cover? Where do i measure? Sorry for dumb questions, SB guy here helping a buddy out......

Michael