Technical Cragar 600 trans adapter?

Can anyone identify what this trans adapter fits? I know the transmission side is ‘39 Ford 3spd trans but, I haven’t been able to identify the engine side. The only number I found on it looks to be “600”. I know 309 is Nailhead, 403 is Mopar, 304 Caddy/Olds……etc…….but, what is 600?

 

No clue.

 

Nash, Hudson or Packard?

 

@Aaron Franck
Here ya go

 

Man I love this place!!! I bet if I had a rusted bolt you guys could tell me everything about it in less than an hour or two

 

Sweet, thanks. That’s a valuable page of information.

 

As long as it's not metric

 

Nah, some of us can handle both...

 

We have “a guy” down under

 

I know a guy who knows a guy.......