1968 SS Dart in progress

Man! These SS looking darts look awesome, 132068Dodge, if I wanted to make my dart look like this, do you know the specs for the rear? How much do you have to shorten the rearend (8 3/4 in my dart) How much to cut when mini tubing? and what rear wheel and tire did they use?
Axle width post narrowing is 52 inches from inner flange to inner flange surface. Pictures attached and of hood hehe.