4 Speed with B/E tailshaft help
Google moparmuscle gear vendor swap '69 dart
Back then the only gear vendor overdrive they had was the long tail stly for the bigger cars, so they mounted a plate off the rear shft boss that brought it forward.
I used that article to make my own, I run the b/e 4 spd in my valiant even though I have an a body 4 spd in the shop, call me lazy..