K frame Identification

The lower piece with the sway bar on it had a 360 mounted to it. It was originally off a 67 a body, you can tell because of the idler arm. I upgraded the steering so I had to go with the newer-ish style idler arm. The only real difference that I can measure is the passenger pedestal (where the engine mount bolts into) is about 1.5 further outboard than the one, (with the swaybar), was mounted. I am just wondering how to make the one with the better idler work with my 360.