.018 to .020 base gasket, 4 mil crank, and Weisco 795's are the common combo. It will require domes be custom as the piston crown will be above the deck a bit.
Other possibilities would be to use the new Driveline pistons, and run a Wicked 5mm crank. May be worth hitting up Roger at Wicked Motorsports as he is quite familiar with your type of build.