The Moto Guzzi / Benelli fork design of the 1970's / 80's use a sealed cartridge hydraulic damper inside the fork tube / leg and rated springs. The stock cartridge damper where introduced with the 1972 Moto Guzzi V7 Sport and slightly improved with the 850 T3 / Le Mans variants.
Fork suspension emulators do not work with the Moto Guzzi design but there are much better cartridge (FAC) and spring ( Progressive) options available. I have fitted FAC dampers to several Guzzi's including V7 Sport, 750S, and Le Mans bikes along with FAC dampers. It takes a lot more work to upgrade a Moto Guzzi Loop frame bike (V700, Ambassador, Eldorado) but adding FAC dampers and Progressive springs to the primitive 1960's Loop design suspension is a marked improvement.
I prefer to keep these old nails stock 'looking' and short of some minor improvements accept the period technology as is.