don't forget, the quality control on these cars back in the day wasn't that good, plus who knows what has happened to it in the approximately 50yrs since new.
then add rust to the equation.

no matter what item you choose, be prepared to do some massaging to get the part to fit, NOS or AMD.
in some cases, the AMD part fits better than NOS. it all comes down to the individual car and what the part is.