backspace help

[74valiant]

i have a 74 valiant that is getting a b body rear end soon. i have a set of 225/50/16 and 255/50/16 tires. im going to buy a set of 16 inch wheels to fit my car. what would be good backspace for this combo

 

[pauly v.100]

5.72 backspace mustang wheels fit perfect with a b-body rear. you need to hog out the center register a little though...that is if you use mustang rims.