Back spacing on B body rear end in 73 Duster

Forgot I even replied to this. Looks like with the 68-70 B body axle, I need 8ā€ wheels, 5.75ā€ backspace to run a 255 or so tire on it with stock spring location? Iā€™m cutting and welding on new perches soon. Thanks.

Yup, that should work pretty well