FYI, I really like the wide ratio setup, I run with 3:07 rear gearing and cars get up and go well IMO
I have used David Key transmisions in TX, very simple/easy, he sent me an empty shipping crate to get trans to him, then he does complete inspection and rebuilding of high quality with wide ratio gears and ships back. Note, I did have to return ship an empty crate (which I could have purchased but less $ to return ship at the time). Have used David Key twice and no complaints FYI.