I've been considering 1 step colder plugs myself. Only because it's still pinging at 4k+ rpm. First I'll do a 180 deg thermostat and see if that will cure the problem.
Other than that, there's really no need to use colder plugs unless you're on boost or nitrous. You want the plugs to be hot enough to keep deposits off and to aid cold drivability.
AKM
'98 Dakota R/T (JBA, Transgo, ported T/B)
'89 Mustang GT (347, Vortech S-trim (intercooled), Griggs GR-40, etc.)
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