A buddy of mine did something similar to his grain truck this winter. He put a new distrubutor with electronic ignition in, since he could no longer get tune up parts for the old one, and it fit just fine, or so he thought. He'd also put a new Holley carb on it, so he backed it out of the barn to work on it, and it locked up about 10 min later.

Turns out the oil pump connector on the drive bear was different, a strange one, and the distributor fit flush like is should, but the drive dog didn't engage, and he had no oil pressure at all. Obviously, he also overlooked the oil pressure gauge.

He bought a nearly identical truck and changed the distributor over, after pulling the pan and dropping the oil pump and replacing the drive link. Parts guys had never seen the part, fits just like the "standard" one but was only installed on farm trucks or some such deal.

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!