Where can I find these? They seem to be made out of un-obtanium. I can only find the copper core plugs that are resistor. Maybe that is what I need? I dunno.
I wouldn't run a non-resistor plug. I think it can cause an issue with the ECU. At least that's what I've learned on the Megasquirt forums. So the plugs you're finding are probably what you need.
I ran Autolite 764s for many many years in my 98, until going turbo.
The 764 should be available just about anywhere. I used to buy them at Walmart even.