Using the original 1972 service manual, I went through the diagnosis and testing procedures with an ohm-meter as described in the manual. All three distributors, modules and coils packs tested out fine. The common problem with these distributors was overheating the coil pack and melting the windings until it shorted out. If the coil windings were going, then the module was overworked and failed as well. This usually all happened without warning.
I have a pile of original repair work orders from London Motor Products, the dealer that sold the car new. There are multiple work orders for replacing the distributor or coil pack or some other no-start condition.
