Thanks John and Jon!
I have thought about the clutch adjustment and will look
at my reverse drive when I will do the oil change.
I am not so sure what to look for in there though...
That's one piece I haven't played with. What would be the
state of my clutch/cams if there was a problem there?

I have also thought about a blown head gasket, and will
do a compression test soon. I would doubt though that
I would still get the engine to revv in neutral with
a blown head gasket?