Just make sure that regulator you're getting is a "B" type (power regulating). Automotive regulators come in two types, known as an "A" type and a "B" type. The "A" type provides a regulated ground signal to the alternator, the "B" type a regulated power signal. 650 alternators up through '79 ground the inner brush full time and need a regulated power signal fed to the outer brush. This requires a "B" type regulator. In 1980, the brush wiring was changed, sort of made the opposite. The inner brush is fed power (switched with the key) full time and the outer brush needs a regulated ground signal fed to it. This requires an "A" type regulator.