I am looking at the same thing this week. I have almost decided on the Ford 11000-A50 unit.
It appear the fit up shakes out this way.
The most common starters fit all 157 tooth flywheels and flexplates, and 164 tooth auto flexplates. The 164 tooth flywheels seem to take a starter with a different nose piece. I confirmed this a few years ago looking a the stick and auto replacement starters on the counter at Carquest.
Yeah, starting in 1993 Ford started using a smaller version of the starter. I don't know if those are small enough to solve the heat soak issues associated with L/T headers though.
i have long tubes and the starter gets heat soaked. I am looking at a starter for a manual. So summit only shows 164 and 153/168 tooth ones. So i take it i want the 153/168 tooth ones?