PC = prechamber
Chances are you'll need to replace return lines. You could try to cut them shorter but these lines are inexpensive. Best to just replace.
Most would suggest getting the injectors pop-tested and spray pattern checked at a qualified bosch shop. Some would just replace the nozzles. Check the Diesel Giant's website for a good step-by-step write up on injectors (and other items).
Definitely replace heat shields (buy extras to have on hand).

btw - Turbo drain tube - I recommend placing grommet on tube 1st, then forcing grommet into upper oil pan. Force engine side in first to give easy access to the latter portion.

Nice looking vehicle.

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83 300d - 390k