Help me understand difficulty of ownership

By now, these cars are 50/55 years old; rust never sleeps.
Make sure you are not buying something held together by hope and prayer; as in
I hope the buyer doesn't see "this", and
I pray that bondo stays glued on.
I would trust a FABO member before buying elsewhere.
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BTW
While Darts and Dusters are both Mopar A-bodys, they are more like distant cousins.
If you are alert, you may have noticed that ;
the long-wb cars, all have standard rear wheelhouses,
whereas the swb cars are all big-tub cars; except for;
Scamp/Valiant, which can be had both short and long, but never had big tubs at all.
If you just want a Cruiser, just pick one. But;
If you value rear-seat legroom, or trunk-space, the Dart is the one for you.
Scamp/Valiants are a sortof in-between car; the 4-doors are long wb cars like Darts, whereas the 2-doors cars are shorties , and all have standard rear wheelhouses.

If you ever get into performance, the swb cars will do more for less. These have shorter wheelbases, they weigh less with less weight behind the rear axle, and the wheelhouses are big enough to swallow 295s.(Except as mentioned)

IMO, 2-door Scamps are a sortof oddity; they Look like Dodge-Darts, but are Plymouths. If you install the big tubs in them, you end up with a super lightweight short wb, Mopar, that with bigger tires on the back, can be a pretty good handling street car.
Growing up, I never knew this about the swb Scamps/Valiant until much later in life, else I would most likely have bought some of/or at least one of, those.

Dart-Sports, are the Demons of old with a politically-corrected name, and carry the 73-up Dart beaks.