I found the answer to my question in the Geno's catalog. The Dana 80 with factory-installed sway bar require spacers for the Mag-Hytec Diff cover and will be supplied. The Dana 70 fits with no problem.
I ordered Autometer qauges from Geno's ( EGT, Boost, transmission temp) and they could only ship the transmission temp. They are back ordered on other gauges. I called four other suppliers and all had the same story. It seems there is a run on Autometer qauges and they can not keep up with the demand. It will be two to four weeks before I see the other gauges. By the way, I ordered from Geno's two days ago and the transmission temp qauge, and A-piller arrived today. They have fantastic service.