I have used Permatex Ultra Gray with success. As with any gasket cement / sealant, one must keep the surfaces clean. I use Acetone or lacquer thinner to remove any traces of oil. When tightening, don't make it so tight that all of it squeezes out. Let it cure, then torque the assembly down.
Thing I have grown to like about the gasketless systems is that they do not seep like the gasketed ones. It is just unconventional, if you (like me) have used the standard gaskets for many years.
Since, my 1987 Savage developed a weep in the head area several years later. Over time it leaves a slight mess on the front of the cylinder jug, but nothing like the classic head plug leak. I'll have to troubleshoot it. I am not losing oil where I must constantly replenish it and there are no drips on the pavement where I park it. It is just that I end up cleaning again after a couple months.
Next time I will replace all the copper and neoprene washers in the head area. Plus I will install a new head bolt access plug, since it has been several years.
One thing I did do (because I had no other guidance but the '86-'88 Clymers manual) was put Ultra Gray on the head plug.
[OT] Having spent the past two years living near the ocean, salt spray and continuous rain means a good tear down and repainting. Now I can understand why others replace galvanized bolts with stainless. Even stainless will rust near the ocean.
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HPT