70vista

Hi,
I am looking to get another project and after doing a bunch of 442's and a Vista Cruiser am thinking of doing a 61 Bubble Top mild custom. What are the spots that rust out and how hard to get parts for these? Ideally I want to find a rust free running car from out west (I am from N.Y.) to do a body off restomod. Just starting my search for one of these and know very little about them. Thanks Steve