I would use the NGK R5671A-7...It's what I use with my edelbrocks (or a -8 for a little colder plug).


67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....