Fits 351C, 351M, 400, 429, 460 with iron gear. Must be used with an MSD 6, 7 or 8-series ignition.;CNC machined billet aluminum housing and Dupont Rynite base; No CARB Exemption Order Number; Supplied with Cap-A-Dapt and rotor (accepts MSD socket style caps); Must be used with an MSD Ignition Control; Mechanical advance assembly can be locked out for crank reluctor systems; Nylon pads ensure smooth operation of the advance weights; Advance weight pins are staked and tig welded to the plate; Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction; Polished steel shaft is QPQ coated and guided by a sealed ball bearing; Maintenance-free magnetic pickup and precision reluctor create stable reluctor signals throughout the rpm range; Easy-to-adjust mechanical advance with supplied springs and stop bushings;