74 Dart 360 Sport

What are you all doing for replacing the 8 1/4 rear. I want something different that I can have fun doing custom, not just a 8 3/4. No know Jaguar IRS is an option. What else open to some ideas that I can take from other car. Challenger rear cradle looke to be to big for the job without major surgery.

Car will be doing some Hallet track time eventually and I want it safe. Brakes front and rear will be on the upgrade as torsion bars stay for now budget and all.