[rotorwrench]

I don't know of anyone who has ever mated a Mazda M50D series transmission to a flathead so I can't say much. They are a lot longer than many others out there. A T5 is long but they can have the shifter a bit farther forward than some.

The T170 RTS series have been used for a long time but they actually have a center shift top on them. They are a 3+1 shift with overdrive as the 4th gear. They had to get creative to get the 4th gear in there. The ones for the 302 V8 applications have the best overdrive ratio. They were used from 83 through 86 and a few in 87 in F150 pickups & Broncos with both 2WD and 4WD. One with a transfer case is no problem since the tail shaft is generally removed to adapt to the torque tube anyway. Since they were only manufactured for those few years, they are kind or rare now days. Folks keep converting them for model As and such and have been for a long time.