Some pieces of info here:
- Most Ford starter cases seem to be pretty similar and interchangeable. Seems like Ford used same cases and just altered the end plates and internals on them. I have had vee-eight (260/289/302, 390) and I6 (200, 250) starters on the table side by side and disassembled.
- starters for automatic trannys seem to have longer ends (thus are longer in total length too) and axle, and the drive gear lurks more out of the case while in rest. Install automatic starter in place of a manual starter and you may have the starter spinning all the time if you get that far; I bolted a 260 auto starter to 260/manual/157 combo once, and starter's end plate iced the flywheel totally when I bolted it down. So, automatic starter can be used with manual trannys but it needs a little backing off from the bellhousing, i.e. some 1/4" adapter between the starter and bell will need to be fabbed.
- manual starter w/auto tranny; possibly the gear won't reach to the flexplate teeth and it is a no go. I wouldn't even test it, think if it partially reaches the teeth - might grind them away.
- 157 and 164 flywheels may have same starters but I'm suspicious until somebody explains why Ford Racing states the mini starter NOT to fit with 164 but works with 157.
This is just something I've seen in my garage, the truth can be elsewhere as always.