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I have a 79SC 3.0L stock CIS with MSD 6AL ignition. MSD does not recommend running resistor plugs with the hi voltage ignition system. So, I tried to order the NGK BP6ES plugs to do a tune up. After checking multiple sources (including our host and every auto parts store) to find these plugs I was told they are NLA and I'd have to get the superceded plug NGK BPR6ES, whish is a resistor plug not recommended for hi-voltage ignition systems. So, I have found a source that i can purchase unlimited amounts of the correct non resistor plug for my application. If you're having the same issue maybe I can help if you need that or a different heat range non resistor plug. Thanks, Kip