Have you thought about putting shims under the rocker assembly insteadd of two head gaskets?
Thicker-than-stock gaskets for XPAG/XPEG engines are not readily available, unfortunately. Even using Premium gas, it’s not wise to go over 9 to 1 compression (about 160 lbs. cranking pressure, typically) with a cast-iron head and the relatively primitive combustion chamber shapes found in Ts, As, Bs and Midgets. The almost inevitable pinging will eventually destroy the rod bearings or even crack a piston. I’ve used two head gaskets in many engines, without problems. Of course, it’s sensible to use new head studs as well, to coat both gaskets with Copper-Kote and to be very sure to re-torque as soon as the engine reaches operating temperature, then again after about a dozen starts and stops of the engine. I also make it a habit to torque any head down when I first install it, then re-torque it just before I start the engine. It’s surprising how much even a single head gasket will compress under initial torque and the second go-round always gets some additional movement on the head nuts
