[Walt Fricke]

Interesting task.

I take it you are pretty sure that the case seal isn't leaking? Everything else, pretty much, can be attended to. If you pull the heads and cylinders off (I gather you are pretty sure the head to cam carrier seal is bad, because otherwise you could take heads and carriers off as a unit), you could get at each through bolt one by one, if there is evidence that any of those are leaking. And the two stud throughbolts behind the oil cooler. New O rings and maybe some CurilT or other helpful adjunct? Chain housings could leak where they mate to the case, new gaskets etc. With cam carrier off, you can replace the carrier to chain housing seal O ring and gasket. Flywheel off to get at the crank seal there, pulley off at the other end. Not much you can do if the O ring around the #8 is leaking, though you can purchase some devices which are designed to help seal that joint externally.

I'd suggest not worrying much about the leakage from the rocker shafts. The external area outside each shaft end is usually pretty crudded up, but from slow seeping. You can try the rather expensive RSR seals on the shafts - some say they do real good, though they haven't kept my motors bone dry.

Or not - is this a pro bono effort?