I have a Ford F-250 that I recently dropped a 460 into from a 1978 Lincoln Continental. The car sat for 14 years not started, I cranked it (with fresh gas from a can) after I got it home, it ran fine so I just did a “poor mans bottom end” on it, I have about 6000 miles on it now and it smokes pretty bad on the deceleration from the passenger side pipe, is this a sign of a broken oil control ring ?
I am sure I should have put rings in it while I had it on the stand in the shed when I put a new cam, lifters, valve stem seals, springs, retainers and locks, oil pump, timing set, rod & main bearings.
The car had 93K miles on it when I pulled the engine and did not smoke when I started it, and it ran so smooth I thought the compression and rings all were fine… it has come back to bite me in the … well the back side, do you think I should pull the engine and bore it .030 with new pistons and rings, or do an in-frame hone and just new rings.
I sat a new Edelbrock dual plane intake under an Edelbrock 600 CFM 4 barrel carb, stock exhaust manifolds dumping into 2 1/2″ to the mufflers then up to 3″ pipe.
Sounds like you have done a lot of work so far. To me it sounds like a valve guide/seals type of problem, I would pull the passenger head off and redo the valve job with new valve guides/seals etc. I’m assuming you checked compression again since the smoke issue.