Copper, basic, Autolites. So you have to change them every 30k, so be it. There are other things that need done about that time anyways - brakes, lube the dizzy pad, etc.. These vehicles were not designed for long maintenance intervals.
Those fancy plugs are just that, a fancy plug. Bosch Platinums have the anode flush with the ceramic, shrouding it to a pinpoint piece of metal. They foul easy, too. The plugs with the multiple ground straps (electrodes) just shroud the center of the plug too. I was always told that you need a high turbulence chamber for those to get the best air/fuel charge into the gap for the spark to get it. The example of the high turbulence they were talking about was turbochargers and superchargers.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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