I've got AC Delco R44XLS in my 6032s right now and they've been the best so far. (2 sets of Champions RN12YC, 1 set of Autolites, all of which royally sucked) Motorcraft AGS32C are also good ones to run. If you have an aftermarket ignition, go with the specs on that (usually 0.050"), other start with 0.040" and go from there.
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