well I know they were putting the 5.0 in the Expoler all the way up to 99. I'm not for sure when they started with them, but I know from at least 94-97 they had gt-40 heads. The only difference from them to the cobra is the cobra's are milled 30 thounths. Late 97 - 99 they were putting in the gt-40p heads. Here is a site good for the gt-40p heads here it is
Allso i have a set of gt-40p heads for sale, $300 complete. Im not for sure where you are located but shipping might be alittle expensive.
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