About two years ago I put a 63 dash in a 61 just to see if it would fit. I did not look like it would just bolt in but it was really pretty close. If I remember correctly it fit pretty well around the windshield area but would have to be modified some near the door post area.
I never installed it and do not even have the parts anymore but if you are interested I could look up the photos I took at the time.
You can shoot me an email at [email protected]. if you are interested and I will see what I still have. Sorry but I have never cared to learn how to post photos on this site.