[Bruce Lancaster]

The crab was discontinued due to problems with condensation and water problems...
The ventilation system did not do enough so they fortified the cap system to protect things. The late cap is better if car is going to be driven in bad weather.
By the way, the '42 type conduits had extra grommeted holes near the center of the engine for the wires that have to cross over from their cap positions. This is neater than crossing them in the distributor area and taping them to keep them out of belts and fan.