I saw your post, try head studs for sure, they offer a greater clamping effect when torqued compared to bolts. That might help you in the long term also. The only other alternative you have for the head gaskets is to go with copper. They do require a little more engine prep to use them(o-ring the block), so that might not help you unless you plan a complete teardown.
It's a full teardown. Upgrades to the oiling system, better crankcase ventilation, alternator upgrade, might remove lumps from the intake (it's fairly terrible :-) and such.
Copper headgasket would be custom, I wonder if I could afford it. No one has ever made any performance part for this motor, ever. None, now or then. There was an Edelbrock aluminum head for the L-head version of this thing in the early 1950's, and Nash made a two-carb "Le Mans" head again for the L-head,(someone on this forum has one!) and THAT IS IT. No one's ever hot-rodded the 195.6 OHV motor to my knowledge.
I was gonna put EFI on this year, but the overhaul takes priority. I will replace the carb at least, the damn thing (Carter WCD) fuel-starves in every hard turn. Rally season is about 2 months away!