Most of what you want to see can be viewed on the primary, which can be viewed with most any type of scope.
As to the 72, it was point triggered electronic ignition and falls sort of in the middle. There were three versions of the point triggered electronic systems and they each have different points to look at primary. The first version had the coil constantly grounded. Dwell was viewed at the small round connector at the end of the wire comming from the points.
Bosch Master, ASE Master, L1
33 years MB technician