I went back to read the thread and was surprised to see that a couple of techniques that have worked very well for me are not mentioned:
1) Anaerobic gasket maker such as Loctite 515 or 518. This has a big advantage in that, unless it is squished tight into the joint, it does not set up or harden and form stringers or bits that can get into oilways. For the cylinder base gasket on my A10, for example, I used a thin layer of 515 with NO gasket, and the joint is as tight as Dick's hatband, no oil leaks at all. My primary case with a paper gasket (Permatex on one side and grease on the other) was leaking after a short time - I replaced it with a thin skim of 515 and now no leaks. Same on the A65 - the paper cylinder base gasket stayed soggy with oil all the time, and would weep a little - with a layer of 515 on clean metal surfaces, no leaky.
2) Copper head gaskets for A10 or A65 - I always use an annealed copper gasket with a thin spray coat of "Copper-Cote" sealer on each side. Never any leaks, problems, or blown gaskets. WORST thing I've ever done is used one of those sandwich-layered "composite" head gaskets - I've tried it on two different bikes - modern technology is bound to be better, right? Both times I had to continually tighten the head bolts down and ended up blowing the gasket.
So that's my data point ....
Lannis