How should my duster handle

Sounds like you may not have got a full alignment.
Open your shop manual, or a '73 downloaded from Mymopar.
The alignment procedure is very clear and must be followed.

1. Ride Height - as defined by Chrysler
2. Camber
3. Caster
4. Toe

Recheck the camber after adjusting the caster.
If the camber needs readjustment, move both cams the same amount.
Recheck camber and caster.

Change the ride height, camber, caster and to some degree toe will change.
This is on purpose to work with the tires to maximize traction as the front end compresses or extends.

Original factory specs were based on the assumption that most roads were crowned, and cars were equped with bias or cross ply tires.
Since most roads now are barely crowned, setting both sides equal or nearly so is fine.
Using today's radial tires, they prefer more negative camber than tires did in the 60s and 70s.
Slight toe in is still needed to prevent 'wander'.

Regardless, all four adjustments need to be used for alignment.