Factory high stall should get it for you. This is a non weighted one. They have the weighted ones also. I get about 2400 behind a mild 360.
http://www.makcotransmissionparts.com/384.html
I am looking for the door glass for a '65 Dart 2dr sedan (not a hardtop). I think both sides are the same. I also assume that '64, '65' and '66 Darts and Valiants are the same part.