My brother tossed the crank in his 75 300D (617 engine) on the highway at about 65. Blew holes in both sides of the oil pan and cracked the block, but the head was fine. So were the valves. Even the cam survived on his, but all three cam towers were busted.

New cam and towers and chain plus guides, IP timing fix, and you are ready to go. Crank over by hand once you get the chain and cam in and see if the valve operate normally -- if you have excessive clearnce or some won't come back up, it's valve job time.

Most likely there is no other damage to engine.

I'ts also possible the cam broke first and everything else came later...

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!