The 73 C Body front disc upgrade is the way to go. Only old parts needed are the knuckles, and if desired, the backing plates. Get everything else new. The C Body sites have more details but it is all bolt in.
https://www.forcbodiesonly.com/mopar-forum/threads/65-fury-disc-brake-conversion-advice.28497/
one of many discussions.
Only other issue is the dual diaphragm brake booster is hard to find.
Mark