Jeff - my theory is that the open injector lines dripped fuel over a few weeks into the cylinders then leaking into the crankcase.

When I started it for a few seconds, it ran really rough (like it was on 3 out of 6 cylinders) and sent out huge billows of white smoke. wouldn't that mean that the head blew and/or some other major internal damage?

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]