[Green 912]

It might be worthwhile to test the motor prior to pulling it. Then you will have a rough idea of what you are looking at and can pre plan somewhat. If the smoke is all the time rather than mostly on startup then I might think rings, P&C.

Do a compression and leakdown test to see if it is the rings or valve guides (or both) At least read the plugs. You might find that only one cyl in involved and can then just fix the problem rather than rebuild. A stuck set of rings on the cyl that had an open ex valve during the long sleep could give the symptoms you describe. Water getting into the carbs and down past the intake valves can make a fine mess too but then you mostly have bigger problems right from the start.

Zims sells good stuff as well as Shasta and 356 enterprises.

Good luck with it.