When a new acquisition turns out better than you thought.....

There's a type of GM mount that you can use to not have to do as much cobbling on the lower part of the crossmember to fit it up. You will more than likely have to modify the upper hoop part of the torsion bar crossmember to get it to fit right and not hang down a mile. You may have already seen it, but link below has a lot of pics and details of how another member installed an A500 into his Duster.

https://www.forabodiesonly.com/mopar/threads/42rh-a-500-in-a-duster-with-pictures.178459/