All Y-Block and FE starters up through 1964 are essentially the same except for the voltage requirements. You’ll have to watch out for the 6 volt units though (1954 & 1955) if you have a 12 volt system. Likewise, if you are still 6 volt, then you’ll definitely want a 6 volt starter. Although you can use a 6 volt starter on a 12 volt system (spins like crazy), the bendix will take a beating and eventually fail (shatter is probably a better word) from engaging much harder. Sure does start good with a 6 volt starter on a 12 volt system though.
But as Eddie mentions, if you’re using a non-stock flywheel, then use the starter recommended for that particular flywheel.

Lorena, Texas (South of Waco)