And the sad thing is that 66 has a ton of one year only parts and would like pulling teeth to replace.
I ran into the same problem with a 65 fury. A 65 and 66 fury look similar at first glance but 65 has so many one year only parts like a $1k + center console. Yet one year later, a 66 fury will interchange a ton of stuff 66 to 69 c body and it gets easier to restore.
66 was the one year only transition for a body. Almost nothing goes to the 67 plus side and so much was changed and updated from the 65 and down side.