The price is right, but fixing the charging system could be as simple as the "3 yellow wire fix" or rotor and stator, or regulator/rectifier. Carbs will definitely need deep cleaning. Check all the rubber parts including tires.
I figure another $500 to put it in good riding condition.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.