Any guidance on my 1970 Duster plans

Do you have drum or disc up front? I would look for a 73+ K frame with complete suspension disc brake car. If your patient, some thing will pop up.
Mopar A Body Disc Brakes & Suspension - auto parts - by owner - vehicle automotive sale - craigslist
Mopar A Body V8 K Frame - auto parts - by owner - vehicle automotive sale - craigslist
[FOR SALE] - 1973 340 Spool K frame with factory disc brakes and sway bar