With the help of my friend Jonathan we welded up a suitable tool to hold the cam sprocket and loosen the bolt that keeps it in place
and was successful in freeing it from the cam.
which allowed me to remove the tin work, remove the cam, remove the head bolts and remove the head.
and discover the offending spot on the head gasket that let go. Note as well the obstructed cooling galleries...
a shot of the damaged head gasket on the bench
now to determine if it is worth putting rebuilt heads on the thing --------