Mine has the 39 Trans. It's got the Clings adapter kit. No mods to the frame to install. Looks straight forward.
Make sure you have all the pieces before you start -
https://modelastore.com/index.php?ro...roduct_id=3656
Van Pelt is the go to place if you need early Ford trans parts.
http://www.vanpeltsales.com/VPPSweb/VPPS-homepg.htm