Help to identify this bellhousing bracket

[plumcrazy 101]

What year would this bracket be which looks like it came off a slant six?

 

[eekvonzipper]

This one is on Fee-Bay... but, it could be listed wrong?

 

[74 360 dart sport]

I had 1 like that on my 74 dart sport and it did work but I called Wayne at brewers he had me send a picture of it and he said early 60's and he said it would work but I ordered a new 1 from Brewers