Riddle me this, Batman!

Question #1 I have was asked by AJ, is this an MSD or other multispark/CD type ign.? Back when GM went to DIS, We had a helluva time getting them thru' the emissions tests, which required a steady RPM reading, had to wrap tin foil around the ign. cables sometimes etc. That, or get another source of RPMs, good times.......