Engine sounds great and I see no shaking at idle. It ain't broke, so don't risk breaking it. Don't worry about dirty injectors. When I opened mine in both diesels, they were pristine inside, and the pre-chambers had no carbon. If you run a few tanks of B20 in the summer, that should help clean the fuel innards, or you can add a qt of vegetable oil every fill-up (best not in winter).

The air bubble in the pre-filter is normal, but the swollen fuel hoses isn't. Replace w/ 5/16" Barricade (for bio-diesel) from NAPA. Several posts on replacing the leaky white primer pump w/ the new smaller black one. It is hard to get at the lower hex, so just smash off the white plastic since you will throw it away anyway. Worst-case, you might have to remove the lift pump to get at it, but avoid since those 3 bolts can be tricky and would need a new gasket. When the woven injector return hoses get wet (weeping), replace w/ 1/8" Viton hose (ebay).

When your power steering hoses show cracks or leaks, search for my post. The H.P. line can be "re-hosed" since it uses field-replaceable fittings (at least on my 300D's).

Your engine looks real clean. The aluminum is oxidizing, but not bad for the Midwest. Perhaps spray it with Rustoleum Rust Preventer (name?). It gives a clear cosmoline-type coating that lasts a few years.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans