which spark plugs for my combo????

[LT1Killa]

My stang is idling funky and the plugs are black. I was wondering what are the stock spark plugs on an 89 GT and whether my combo needs colder plugs???? I have E 303 cam, Cobra Intake, GT40 heads, 70mm TB, 75mm mass air, full exhaust, 4.10's, etc. I just bought the car, and I need help.

 

[LT1Killa]

bump

 

[LT1Killa]

I just pulled them out and are autolite 764. Anyone use these??

 

[LT1Killa]

they are gapped at .45

 

[LT1Killa]

Well, then what plugs do you guys run???

 

[nazstang]

i have motorsport cobra plugs, and they work pretty good. i have an extra set if you are interested. just let me know!