Date registered: Oct 2007
Vehicle: 30+ mercedes and a suburban to tow them
Location: Long Island, NY
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Any straight 6 cam will do, as nobody cares one wit about smog performance on a 68. If you go used, you the journals, cam shaft and rockers that have been marked during removal so they go back under the same spots.
Note that there are different height journals and different diameter camshafts, so you will have to keep them properly matched. For instance, the 1968 model 280se has a journal and cam shaft combination that is 1mm off from all later 280se motors.
Measure the space between the back of a cam lobe and the top of a valve stem with the removable spacer out of the way before you take it all apart. And measure again when its all back together. If you're a 1mm off, you'll need different spacers to compensate for the change.
(and yes, doing that measuring before you assemble it is good idea too).
As for assembly work, is the motor in the car? I means undoing about 1/3 of the head bolts to remove the journals.