Howdy,
In minnesota. Just south of St. Cloud in Annandale There is French Lake Auto Salvage/Parts with acre's of old cars. Last time i was there they had around 15+ 1970-1972 Cutlass/442 model cars there. They pick up from Az, and other southern states. Its better to Email or Call them cause they dont have all the parts inventoried. They should have the parts you need.
http://www.frenchlakeautoparts.com 320-274-8497 OpenTue-Fri 8-5 Sat 8-3
They should have the parts you need. Also in Fairfax, MN its located south by New Ulm there a Salvage yard you could possably get a donor car.
www.classiccarsrotting.com
Let me know how it goes. I have many other places in MN that you could maybe find what you need.
I'll Joining the MN Olds Club when i return stateside.
Good Luck, Casey