My 66 dart has had the front and rear converted to LBP. I used the later disc brakes up front and used new axles for the 8 3/4 that was out of a Duster. I run a 15x7 in the rear with a custom back space. I ordered them from Summit years ago. I want to say it is like 4 5/8. The tire is a 255 60 15 Drag Radial The rear springs are superstock and have the rear end quite a bit in the air. Fronts are just a 15 x 6 out of the bone yard. I forget the back space but probably 3 3/4 or 4.

The rear left side rubs on the lip of the drivers side quarter when going around corners. Getting a tire under an early A is not fun. I wish I would have mini tubbed and relocated the perches when the car was on the rotissere.