Getting a new transmission

My Dart I got last month is in the shop right now. The guy I bought it from said the current transmission was from a 95 Ram truck. I took it to a local shop to have them look it over and fix a couple of leaks. Just as I feared the old owner did a horrible job putting it in. I decided to just have them put in a newly rebuilt 727 transmission. I can't wait to get it back because my hood scoops came in the mail yesterday. Next on my list is a steering column, steering wheel, door locks, classic radio, and thinking about a vinyl top. I've realized just how hard it is to find parts for these cars!