ball stud frame bracket location?

I am converting my 1967 barracuda convertible from an automatic to a 4 speed manual transmission. I have gathered most of the parts, but I am wondering where to locate the bracket on my car that attaches the Z-bar ball stud to the frame.

I would like to determine this before I paint the engine compartment, not after I install the engine and transmission.

Does anyon have any suggestions??

Bob in MD

PS: I am willing to travel a little ways from SoMd to take measurements off of someone else's car!