I don't have any leads for you, but will say I've seen a few pop up on kijiji Canada over the past few years. There might be a thread or two about them on this site. Seems the '66 2 door Grandes are way more plentiful than the 4 doors, though.
I have one I was going to use for parts but is in to good of shape for that. I don't really want to sell it but i'm working on a gto and could use the dollars. I live in central alberta. Its a 66 grande 4 door hardtop, I drove it home but is currently running a 250 six cylinder with 2 speed auto.
I don't have any leads for you, but will say I've seen a few pop up on kijiji Canada over the past few years. There might be a thread or two about them on this site. Seems the '66 2 door Grandes are way more plentiful than the 4 doors, though.
Good luck!
I seem to remember one on site in the summer / fall of 2021 in either the Ottawa ./Montreal area ? and was an original owner ? Was that light gold colour