Things I like to recommend
Fuel
http://power-barn.com/moto-guzzi-1100-keihin-fcr41-carburetor-kit/
Exhaust
https://www.ebay.com/itm/Moto-Guzzi-Le-Mans-Zard-Exhaust-Racing-Full-System-with-Removable-dB-killer-/302347580013
Ignition
https://revivalcycles.com/collections/for-your-ride-makes-and-models-moto-guzzi/products/c5-performance-moto-guzzi-dual-point-distributor
Shocks
http://www.yssusa.com/series-g.html
some of the items I recommended I have on the shelf ready for my '80 SP2