I restored a 70 RT/SE with air about 2 years ago.. Sent all the hoses to Classic Auto Air down in Fla.. The changed all the hoses to be R 134 compliant replated the ends ect.. The looked and worked fantastic.
Wasn't cheap as I remember tho either 700 or 900 bucks.
Might want to give them a call and inquire..1-877-342-5526