Welcome to the Forum. I posted a welcome to you down in the New Members Welcoming Forum. We would love to see the pix of your Tbirds! If you have the VIN # and the Data Plate breakdown, you can go to the Technical Resource Library (always a part of my signature element) and look it up. That will tell you what it left the factory as, and what the exterior color was, interior, date scheduled for production, tranny, and axle. Also go to www.tbirdregistry.com
and to Search, plug in the VIN # and see if someone in the past has registered it on the Registry. If so, that may give you some history on this Tbird. Yes, I would imagine that there were not to many of them made with 4spd trannys, so if it can be saved, I would think it would be great to do so.
Go down to this section in the TRL and then look for Data Plate Breakdown.
Data & Resource Library On Thunderbirds (1958-1966)