Overdrive in Early A

I‘ve spent hours looking through the old posts on this subject, but I have found very little real first hand information on installing an OD trans in an early A. I am not interested in a Gear Vendors unit, or on information about 67 and up OD installs. Is there someone in FABO land that has installed a 42RH or a 200-4r in a 63-66 A body?