I'm fairly certain that's a BMS stand alone ignition module that would take all the inputs of a stocker except the ECM. The nobbs adjust the timing on the module itself vs taking input from the ECM. I was looking for one when I was going to try to carb my 4.1 but moved on past.
yeah, I believe that is called a "Power Source Ignition". I think there are some details in the Red-Whilte-and-Blue book about hooking it to something. It takes a 2-ring balancer and 2-channel crank sensor.