I believe a very similar if not the same setup was used on the 4000lb Granada and variants. If the MII had problems in bigger cars we'd have heard about it in the last 20 years or so.
It's relatively light and compact and the aftermarket support in the street rod sector is unbelievable. The geometry is pretty good too.
The Mopar bent torsion bar fronts have bad geometry and although there have been quite a few put in, many have required expensive rework to get to handle right. Look up E-burgs many negative comments about them. They represent a low point in Mopar suspension design, built during the years that ChryCo was flailing trying to keep afloat and putting out such gems as the Volare, whose fenders were known to rust off in three years or less.

R.