The following technical articles from old Motorcycle Mechanics magazine might be useful for someone doing a rebuild, although there is probably better information available today.
Ducati Single - Engine Analysis Motorcycle Mechanics Aug 1970.pdf
Ducati 750 Bevel Service Guide - Motorcycle Mechanics, Sep 75 .pdf
Ducati 860 Rebuild - Motorcycle Mechanics Feb 78.pdf
Hailwood's TT Ducati Secrets, Motorcycle Mechanics June 1978.pdf