Not exactly sure what you your referring to as far as the setup being weak unless ............

Chrysler used three different ball joint sizes during that era; Large (normally found on the big full sized cars and Imperials (C Bodies)), Medium (also used on some full sized cars, intermediates (B Bodies), and compacts (A bodies)), and small (found on some A bodies).

The easy way to tell if if the Dodge has the small joints is by looking at the wheels. If it's the standard 5 on 4 1/2" bolt circle it's got the medium ball joints which are more than adequate for even a big block swap. If it's got a 5 on 4" bolt circle it's got the little ball joints and you should upgrage to the bigger pieces (control arms, spindles brakes etc) if your planning on an engine swap.