The emissions systems are reviewed in the Master Tech Conference.
Scroll down here to the year of interest and see what was new, and hten checkthe year before as well. https://www.web.imperialclub.info/Repair/Lit/Master/If looking at the html is a pain, go over to www.mymopar.com and get it in pdf or youtube format.
No. Its part of the OSAC.
Basically a delay on vacuum spark advance to reduce NOx with increasing speed. Also incredibly annoying from a drivers point of view/ Cleaner Air System Highlights, p.11, 1973 Chrysler Master Technician's Service Conference Book 1
Chrysler dedicated a whole Master Tech Session to 'Drivability and Emissions' and another to "Getting 'em started" (not OSAC related)
Here's the page with OSAC, and the next page has the understatement about a driver may notice decrease in acceleration and more throttle is needed. I'll tell you from at least the perspective of a slant six owner, it was quite noticible and annoying. 1973 MTSC Book 7, Exhaust Emissions and Drivability
