I have been playing around with BW overdrives for 60 years and I still like to drive them. Chev SM 319 transmissions are around. I mostly played with Ford transmissions that use A BW T85, T86 or T89 front box behind either an R10 or R11 OD section. The BW front section is a lot tougher than the Muncie but hardly anyone drives like I did 60 years ago. The GM Saginaw is very similar to the BW front section. Some parts are interchangeable between the GM and other OD, but not all. The photo shows one GM solenoid and two Ford solenoids and they are noticeably different.

https://photos.app.goo.gl/Q6bbNYoFKrHeU3Ac7

I wire my overdrives like Ford no matter what the installation is. I like it much better than the wiring GM used.