This is the second iteration of the LT1 distributor offering ventilation under the cap to prevent ionization and moister build-up and have a large drive plate on the rear that engages the drive pin on the front of the camshaft that also allows the use of aftermarket roller timing chain.  These are a direct replacement for 95-97 cars and an excellent choice for upgrading a 92-94.  These are O.E. quality and manufactured by Accel.