Pro-Billet is Holleys most popular distributor and they require an Ignition Controller such as a MSD 6AL or 7AL-2, ACCEL or Mallory Ignition Control. The distributor has a 2-pin connector that plugs directly into most aftermarket CD Ignition control boxes.
MSD - Street Pro-Billet - Vacuum Advance - Chevrolet V8 - Red
MSD - Pro-Billet Distributor - Vacuum Advance - Chevrolet V8 - Black
MSD - Pro-Billet Small Diameter Distributor - Chevrolet V8 - Red
MSD - Pro-Billet Distributor - Locked-out timing - Chevrolet V8 - Black
MSD - Pro-Billet Distributor - Even-Fire - Chevrolet V6 - Red
MSD - Pro-Billet Small Diameter Distributor - Chevrolet V8 - Black
MSD - Pro-Billet Distributor - Extra Tall Slip Collar - Chevrolet
MSD - Distributor - Chevrolet 194 / 230 / 250 / 292 In-line 6 Cylinder