You would have to check it out but a 66 Fury column and linkage might bolt in and be the cheapest. It may not be concourse correct but doesn't sound like that is a concern.

I stayed with the cable shift in my 65 C body and some days wish I hadn't. It works good and everything but it just seemed like I spent a lot of money on it by the time I replaced the shift and park cables. Different converter, etc etc