I cannot understand why Mike likes the Mallory distributors. I bought a series 32 for my BB and it came with a plastic cover over where the vacuum advance would attach and the plate inside that the pickup rides on was totally loose with no attachment to the dist housing. OK, factory error of some kind and I'll send it back to Summit. I order another and this one has the plastic cover where the vacuum advance would go but this plastic cover has an arm connecting to the plate that the trigger rides on, fixing it in place, kinda. The fit of the pin on the plate that the trigger rides on is so loose/flimsey that the trigger plate can be moved way too much. Crap IMO. Ok, I'll order a MSD and send back both Mallory units.
The MSD is the same price as the Mallory and the quality is an order of magnitude better. Plus it has the springs and advance stop donuts making the unit quite adjustable. So why do you use the Mallory distributors Mike? I think they are junk based on the 2 new ones I have seen.