Slant 6 on a V8 K Member?

67 is a good year K frame "to get rid of" because the idler arm is a "one year only" deal at the K frame end. Go find yourself a 68--72 /6 K, buy a new 68-72 idler and don't look back.

Or if you do not have factory anti-roll (sway) bar, you can even use the 73/ later frame and convert the engine to "spool" type mounts