I agree after owning and building several Darts, Dusters and Valiants. The odd torsion bar broke on a few of my A body cars when I started to add more torque and hp. BBs were harder on front end parts but even the small block cars would break things.
I would suggest a full tube frame for the weight, engine placement and extreme torque potential of a Cummins 5.9 What engine is in the Duster now?
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