HEI and External Voltage Regulator

[cleszkie]

This is a question that I should probably post in the electrical board, but I have had good luck with the advive I've gotten with the Blazer owners, so here it is:

I have a Blazer that I want to keep very original, down to the external voltage regulator. The problem is, I want to be able to swap out the points distributor on occaision for an HEI unit without cutting up the wiring harness. However, I understand that HEI modules do not like voltage spikes that can occur with external voltage regulators. I plan on using the original voltage drop power lead from the ignition to energize a relay, which will provide direct power from the battery to the HEI. My question is, will this setup prevent voltage spikes to the HEI, or will the spikes still be seen at the battery (I suspect so)? If so, are there any sort of in-line voltage spike buffers that I can install to prevent ignition module damage?