Most everyone uses the Detroit Speed and Engineering mini tub kit. Do a search for mini tub and you'll find tons of info. You can also check out DSE's website for tons of pics (Link to the left)
There is no magic number for the rear end width, the tolerances back when these cars were built varied greatly from car to car. It'd be best to complete the mini tub, purchase the wheels and tires, (most people run 6" back-spacing with a 335/30/18) then mock them up square in the wheel wells to get a good measurement for rear end width.
Good luck. There are plenty of people here that have completed the install to answer questions.
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Bill
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Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
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