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I believe you may be confusing your client with some other person named James McNally. There are at least five people named James McNally listed in IMDb. The one who was in "Fear Strikes Out" is James McNally (I), who has not had any credits listed in IMDb for the last 57 years. The connection between that James McNally and Louisville, Kentucky is that Louisville, Kentucky is a keyword for that film. That probably indicates that some scene in the film takes place there, although I haven't seen the film so I don't know exactly. Where any of the actors in the film are from is a completely separate matter.

More likely your client is one of the other listed people named James McNally, although I have no idea which one he is. None of the James McNallys listed in IMDb have their birthplace or residence listed, as far as I can tell. Hence, if I was searching for your client and knew only that he was from Louisville, I still wouldn't be able to determine which of the James McNallys he is.

If you clarify the situation, contributors here may be better able to advise you.

Louisville being a keyword for that film makes sense as it's about Jimmy Piersall, a major league baseball, but played minor league ball in Louisville.