I ain't never dealt with the new(er) MP Mallory based MP dizzys but I had read something bad about it (that sounded credible at the time/stuck with me). A guy on FABO is selling metal collars ($18 to your door iirc). When you get another one (new or used): set the axial to .005. check/correct top plate pivot pin slop. Get with Nacho on equalizing the teeth protrusions/minimizing reluctor gap change from vac adv operation. check/confirm rotor phasing. reduce rotor blade to cap terminal gap to .015 (drill out the rivet & sub in a slightly longer piece of brass or the NAPA Echlin MO3000 rotor has a .060" longer blade). get a cap with brass terminals. Check/correct lower dist tang to intergear notch rotational slop (peen or weld). dial in initial/springs/total/can tip in: those (4) IN ORDER. Holler if you need a shim (I ain't going anywhere (for now). EDIT meant to say initial/total/springs/can tip in