We did it to a 69 Coronet. I wanted to use 15 x 10 wheels with 3 1/2 backspacing so we narrowed the rear end 3". Springs were original so needed upgrades with all new hardware plus exhaust is a prob so new stuff. Two days 2 people with one being a good welder. All done all our labor including housing narrow work and new Moser axles we figure a little over a grand. New suspention without air shocks and the look I wanted well worth it. Since the car was due some of it anyway the cost and time was fine. After we tightened up the rear we found the front suspention was in need of new modern upgrades. Subframe connectors came later and the car is great with it all. I would suggest doing the connectors at the same time and save by combining the work. Results are wonderfull.