Small diameter distributor for 289/302 engines, includes steel gear and vacuum advance. Must be used with an MSD 6, 7 or 8-series ignition.. The Street Pro-Billet Distributors are the perfect choice for powerful engines that see plenty of street time. This canister provides improved economy and an accurate mechanical advance lets you dial-in an advance curve to match your driving needs. A magnetic pick-up produces accurate trigger signals that remain stable throughout the entire rpm range of your engine and is completely maintenance-free.