Please help Identify this K frame

So a brief back story, I bought a front clip of craigslist because I need a 318 k member for my 74 Duster. My silly self seen this listed as a 74 front clip so of course I though perfect. It still had the 318 and tranny as well as disc brakes, but as soon as I pulled the motor and tranny off of it yikes that's not an "A" body k frame.

I think it is an "F" Body one but I'm a newb and not to sure. Going to need to list it to try to get a couple dollars back.

Let me know if you can help ID it. At least this way it's listed correctly for the next guy.

Thank you

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