Valiant to Duster disc brake/rear brake swap

Best situation would be to park the donor Valiant next to your shop and start tearing all the parts off it while you are working on your Duster. If the Valiant parts are in good shape you'll want to transfer the entire front suspension including the brakes and K frame over to your Duster. The late model design is better than the early design so if you can avoid buying parts twice that would be good. But as always, you'll just have to do what you have to do.