Tech info wanted; Lean Burn Dist

Man, I can't find that specific information either.
Although I did find almost the same question when you asked it in 2012 when Kit recommended a method to find out but you didn't have a distributor yet to test with.

If you have one now you could do what I did for limiting max timing and print out a small degree wheel to attach to the rotor tower, an hei or Pertronics ECU and a coil and battery.
Fire a timing light on the degree wheel with one pickup and then the other and the difference between fires on the wheel will tell you what you want to know.

Kit could find out real quick if he has a lean burn distributor.