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Gone but never forgotten
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25,239 Posts
For a street driven vehicle, the 7mm are fine. I have 7mm on my daughter's '69 302, and 8mm on my '66 289. They both work just fine (very similar setup on each). I'd suggest NOT buying the Pertronix wires if you have headers. They're good wires, but have a straight plug boot. I have them on my '66 and it's just about impossible to keep the boot off of a couple of the header tubes.

If you always do what you've always done,
You'll always get what you've always got

http://www.classic-mustang.net/johnpro
 
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