[AMiller]

Wanted to thank you folks for lending your thoughts. Things are looking up.

Almost tore the top end off but gave one last go at the obvious. Turns out I had a few small problems that lead to a dead cylinder. Still not sure the exact circumstances but the end result was clear.

At some point the e-clip that holds the vacuum advance arm in the distributor came off and let the arm lose. This seemed to lead to very weak spark on #4 cylinder, Why? I dont know. Plug would fire when you removed it to test but was not making good fire in the cylinder.

Last but not least it seems there was a slight vacuum problem.

Anyway, she no longer has a rough idle, no popping in the passenger side exhaust, pulls clean to 6 grand and 8 out of 8 cylinders produce hot gases now.

Aaron