As long as you don't loosen the bolts and move the position of the pump, you won't need to retime the fuel delivery. Just make sure marks are all aligned.
Remove the tensioner, remove the cam sprocket and don't let the chain move on the pump while you R&R the head.
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in