Reply to "ZF Horsepower Rating"

That's right, Push-1267; you have one of those famous transitional ZFs. It's impossible to tell what parts are inside without total teardown, but the mainshaft on these ZFs was a little shorter and uses a steel extension for the pilot bushing. Later assemblies had a different length mainshaft & bellhousing, so a pilot extension was no longer needed. Changing a pilot bushing is a real exercise in these due to the design; I recently modified one for a Mangusta owner (same setup) so it's easier to R & R. Details in a PM if you're interested.
BTW- a tip to prevent potential breakage: leave out the bolts & cylindrical spacers that run at an angle from the bellhousing to the early side plates. These really don't do much bracing but do tend to loosen over time. Loose bolts have cracked one or both side plates in two, which leads to lubricant loss and much expense! A very few such sideplates were cast aluminum from the GT-40 program, but most were cast iron. They look identical but if they're magnetic, they're iron.