My car has a 39 trans (2 & 3 syncro) with the Cling's adapter. The adapter kit is around $800 and you'll need a trans. The Mitchell trans is about $2,400 and the OD is about 3,400. You could go with a T5 trans and end up will a full syncro 5 speed with overdrive $900 plus the trans.
https://www.lainefamily.com/ModelAFiles/ModelAT5.htm