[Big Kev-O]

The lights do not go through the ignition switch, if they did you would not be able to turn them on without the key turned. Your ignition switch should be able to handle the load. Swapping out the resistance wire & using the Packard terminal is a clean & reliable way of connecting your HEI. Adding a relay has it's pros & cons. Yes it takes a small load off you ignition switch & provides a strong 12v power source but it also adds another potential point of failure. If you add a relay I recommend keeping a spare in your glove box.

Modern day Chinese made electronics are not exactly dependable. I have purchased 12v relays, ignition switches & headlight switches from auto part store that have failed. The first ignition switch I bought didn't last a month.