Valve to piston clearance

Your best option is to have valve reliefs/eyebrows cut into the pistons for valve clearance... But that cam has huge lift at .643"/.660" and will require deep cuts... You should check the thickness of the piston before machining to make sure that you will not break through the tops when making the valve reliefs deep enough for that much lift...

Or see if there are any other pistons available with shorter dome and deeper valve relief pockets...