I was a motor engineer specialising in carburettors for many years. In comparison to S.U. Strombergs don't get a look in. Most spares for S.U. are still avaliable. Webers are a different kind of carb, probably the best carb in the world (IMO) when they are correctly set-up,nothing comes near. BUT they do need skilled attention, far more so than S.U. For most usage I would recommend S.U. Pookie