You can't go wrong with Rancho. They've done a couple of transaxles for me and their customer service has been great. The shipping to the West Coast is around $100 each way (if you ship out a core).
Since you're in New York, I would try emailing Adam Wright at Unobtanium in Ravena, NY, up near Albany.
Tell him what you have for an engine (that 2332 will get his juices flowing) and what you're looking for in a transaxle and ask if he knows a reputable shop in the Northeast you might use. If anyone knows of a good shop, it's Adam. Tell him Gordon the replica guy from the Northeast TYP356 club sent ya (he's a member). Just remember that he deals in original 356A/B/C stuff but may know about shops who also work on Type 1 stuff (not all do).
I think that the guy who built @Al Gallo an engine also does gearboxes and has a great reputation. He's about an hour from Boston, near me. Wouldn't take much for me to go over and visit for you, either. Might even pick it up and meet you half-way in Waterbury or something.