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Seriously, what bmc said above is right on target. Before you start making aesthetic upgrades, you should ascertain whether the bike is mechanically sound. It may be running well now, but keep in mind that your bike was built before Guzzi began using the Nikasil/Nigusil (nickel/silicon carbide) cylinder plating in the late 70's. Your bike came with OEM chrome plated cylinder linings. Over time, these inevitably begin to flake off and send chrome particles/flakes/clumps into the engine oil, where they clog oil passages, lodge in plain bearings, score pistons and do all manner of mischief that essentially wrecks an engine. Many vintage loopframes like yours have been converted to modern Nigusil-plated Gilardoni cylinder-piston kits, which are readily available.It would be prudent to take off one, or better, both cylinder heads, rotate the pistons to bottom dead center and examine the bores. If they are smooth and flawless, the Gilardoni conversion will likely have been done. You are good to go. If you see any flaking or irregularities, stop everything and change the cylinders ASAP before you get a chrome-induced engine seizure.
No need to remove a cylinder head. Just remove one sparkplug, poke a "magnet on a stick" in until it touches the cylinder wall. No attraction = chrome, very slight = Nikasil, strong = iron liners. If it's chrome, it's bad - there is no such thing as "good" chrome bores IMO. They will all flake eventually, usually sooner than later.