Be very carefull of those little plastic cam oilers!!!!! They break very easily, it isn't always obvious they are snapped off, and the cam will sieze in the towers and break if they aren't working. Typcial DIY damage to M117 engines, according to my parts guy.
Otherwise, this is seems to be a fairly straighforward job -- much easier than on the newer diesels, where the cam has to come out!
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!