mockup a piston in your block and measure deck,
The 340rpm head is designed to use flat top OEM or L2332F/L2316F which are usually .018 above deck range. The L2322 you have has a dome. You could mock things up with an old .040 head gasket and clay the chamber to check clearance. You could also mill piston top off at .060 above deck and just use a .040 gasket to set the quench.
