Hey David. I might be wrong, but I think the reason the "p" heads are slightly different is because they were originally manufactured for use on explorers and the sparkplugs are angled slightly different than regular heads. As far as this setup goes, i know i'll love it, because it's nearly the same setup as in my 91 Drag mustang, and that thing flies :P In terms of the setup in your mustang, did you change your radiator? On my 91 I added a four core aluminum and was thinking of doing something similar. I also might swap out the fan for a newer flex fan as well.
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