Many Thanks to all for the new suggestions.
Changed the fuel pump yesterday and readjusted the timing (retarded to service manual spec).
Hope to drive it over the weekend. Weather here is thunder
& showers. Will wait for a dry spell.
My endoscope inspection did not turn up anything new. Cylinder walls look good. No gouges as if I had a wrist pin problem.
Compression is also good. All 6 @ 150#'s. No deviation. Of course, this doesn't preclude a cracked piston.
Will also disconnect one plug at a time and drive it under load. This sounds like a good idea...
Replaced the rear main seal and the clutch last year. My helper DID NOT install. the new flywheel bolts I gave him. Been bothering me that maybe one or more have come loose.
I'll let you all know what I come up with...
Thanks!