I'd give this a serious second thought. One hypothesis is retorquing head bolts can accelerate the progression of cracks. No reason to replace a #14 head that isn't showing symptoms, but similarly little reason to recondition and reinstall a #14 head that's off the engine.

Fresh set of injector line clips and rubber pads.

Make sure it has a later style vacuum pump. I have a couple available.

If you're going to do anything to the ALDA, do it while the intake manifold is off.

See if you can find a deal on a 603.971 (92-95 140 Diesel) exhaust manifold.

What are you doing for a transmission?

Sixto
83 300SD