Hi Chuck--------------Depending on what year Z you have, ZBarn has a kit they sell for this. Part number DT-1299, Differential Swap Kit, R-180 to R-200. Price is $125.00 plus freight. This kit contains the proper mustache bar along with the diff mounting brackets you will need. Again depending on what year car, you may also need to invest in a different driveshaft. I suggest you give the folks at Z Barn a call. They can advise you on what's necessary to do this swap.
Roadman
Gulfport, MS