Had these questions when I went from my 88 frame to an 86 and these same gentlemen helped me out. Looks like it was thoroughly answered here.
FWIW, the bolt through the head is highly debatable, but I do not use one and have had zero bad side effects from it. Some say that it does not allow the cylinder/head to expand and can cause head gasket issues. Most that DO use the bolt through the head agree that you should not torque it down very tight.
I believe most everyone agrees that the head stay bracket should be bolted to the frame, regardless of using the head bolt, as it adds needed rigidity.