I ran the Bosch Platinums for many years, based on a comment from Ken G. that they found another 5 hp on the dyno with them on a race engine. Never could tell that they made any difference in my street engine, though.
But after I had an entire set of them fail, and Ken noted the same failure in one of their race cars; I switched back to the old Champion L87YC plugs. They don't last as long as the platinums, but they are readily available and cheap.
They are non-resistor plugs, but I've never noticed any particular ignition noise from them (I do have resistor plug caps and of course the distributor cap has a resistor in it) even in my own radio. Years ago, when I used a CB radio in a different 56 TR3, the main source of RF noise was the generator (and I added a filter cap on the output to cut down the noise).