Justin:

The 350 is a no-go -- oil sump and subframe will occupy the same space, alas. I'd personally go for a junkyard engine, the exchange is quite straightforward. Remove frome above with tranny, pretty easy. A Ford 302 would fit much better, as would a Chrysler 318.

As I said, unless you see tons of blowby in the air cleaner, and no one left the oil filler cap off with the hood up, the engine in the yard should be OK. Certainly better than yours with a blown head gasket.

If you replace the fuel pump and lines (to hold the higher pressure), you can also replace with any of the newer engines with K-jetronic (save the old cams, more power), and if you also snatch the computer, you can use the KE- jetronics as well, same block. Might be fun to stick a 5.6L W119 in there.....!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!