Well, I respect your feedback on my reply Danimal. I didn't mean to be condescending towards anyone with my opinions.

The answer is NO, the capacitor Spensley purchased is not the grounding kit.

The grounding kit operates on the premise that there is enough resistance in the circuit grounding the engine to the chassis to reduce the voltage seen by the ignition system sufficiently to compromise the ignition system performance to a level detectable by the driver.

The grounding kit is, in my opinion, not effective because the ground resistance between the block and the chassis is irrelevant. The ignition circuit does not include the chassis, but rather is made through the positive battery cable, the fuse/relay circuits, the ignition system itself, and returns via the negative battery cable, and that is quite low already.