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We have discovered for decades now that the motor-plates and the ground strap to the block does not provide a sufficient ground. It was initially un-covered that the black etch marks that appear around the block holes of front and rear motor plates was made due to the poor ground paths(we even saw etches in main and rod bearings). With coated studs, aluminum heads, coated gaskets,powder coated frames and customers relaying on the ground strap from the chassis to the block was not enough.
To be frank, the spark plugs are in the head and not the block! With this in mind, it was best to have a common ground between the electronics, battery and even the coil to eliminate any floating ground issues that may occur. Majority of the time ,this elinminate "misses" ,tach issues,data logger problems..etc.

Look at the drawing below:

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