Nothing fancy ... no exotic metals, no multiple electrodes. I personally do not care for champion brand. I like PLAIN: Bosch, Autolite, Motorcraft, ACDelco, ND (nippondenso) ... in no particular order. Get whatever range is specified by plug mfg for your year & model ... 74 on back w/ points gap plugs about 0.035" ... 75-up w/ electronic/HEI dist gap plugs about 0.045". If it's been awhile since you changed plug wires ... get new wires too ... your car will like any brand with a helical/spiral core-conductor. Accel P/N 5050 have the spiral core & are correct P/N & fit for 75-up vette w/ HEI ... nice price too. Welcome to CAC!
JACK:gap