Hi
Are you putting the 6.5 into the 83?
If yes then you can use the mechanical pump.
If you want to use the mechanical pump in the 96,then a few other things need to be answered,like is the 96 auto or manual.
Give us a little more info on what you are doing and someone will give you the info you are looking for.
Thomas
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews