Help with spark plug selection ASAP!

[astronut1885]

Hey guys. I was talking to my mechanic about getting new plugs for my motor when we do the H/C/I, and he said because I am installing GT40P heads that I needed plugs from an 86 mustang GT because they were "peanut plugs". He said he wasn't 100% positive, but he thinks that's what I need. Does anyone know exactly which Autolite plugs I need to put into GT40P heads? Thanks,
Rob

 

[dvs bullet]

you could probably go to the parts store and ask for plugs from an 98 explorer 5.0 and they should fit, right? That's where the gtp heads come from.

 

[89stanglx]

Autolite 764

 

[astronut1885]

That's what I thought, get ones for an Explorer V8. Are you sure on that part number 89stanglx?