In my "keep" stash, I have two big plastic totes full of '66 Coronet-only parts, trim, and such, plus three decent grilles (complete), bumpers, glass and more. Similarly with the Imperial - trim, lenses, interior trim, two AM radios, and more. And my '69 D300 has its own tote stash. The boxes are marked. And, I have a complete 3,300-mile '73 318/904 from a Barracuda, and 90% of what's needed to build the spare '73 440 engine. All spares.
Everything else? I'll put up a list in the Spring to see what sells. If any of the three vehicles sell, that set of parts go with, more than likely.
My younger son wants the '69 D300, and my older son wants the Coronet.