my response was intentionally over simplified, and I have very limited knowledge for pre-1969 model year stuff.
But on the subject of identifying, there are a couple different cases and many have a narrowed end.
I agree that using one physical feature as a means of identifying a good starter is probably not too reliable.
The stamped number on the case should indicate what the contained windings are - and I'd go by that as the start of anything.
Also, if not concerned about numbers, I'd advocate getting one of the mini-high torque starters, as they would have less heat soak from more air movement around the starter, versus the original huge ones which nearly touch RA manifolds.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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