It is really not that big of a deal. As already said, remove the vacuum pump, and I prefer to completely remove the chain tensioner.

Put the crankshaft at TDC. Install the cam shaft with the timing mark lined up with the cam bearing tower timing mark. Install the camshaft gear, moving the chain around on the gear as necessary.

Once you think you've got it all together properly, install the tensioner (don't forget a new seal ring), and then rotate the engine by hand through at least two completed revolutions of the crank (one complete revolution of the camshaft). Immediately stop if you encounter any abnormal resistance - you probably have a valve touching a piston.

If the timing marks on the cam/bearings lines up with TDC on the crank (or at least within 5 degrees, assuming your timing chain is not worn out), then you've got it right.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC