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My friend that works at a dealership came across 2 different sets of heads that I may be able to use in a future headswap. He found some 5.4 Heads that came off of an Excursion. What he told me is that there are 2 types of Heads that go on the Excursions. I was wondering how I would be able to tell which set he found along with whether both will bolt up to the intake. The other set of heads he found was off a 99 F-150. Are these heads/cams the same that would come on a 99+ Mustang? I just wanted to make sure that I am getting all the ponies I can out of this.
 

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The 99 f150 heads are not "PI" heads, unless they came off a Lightning. The Excursion heads or any 5.4 head 2000 and newer are PI heads.
In either case, the good "PI" heads have the rectangular ports and are usually branded with "PI" somewhere on the head usually by the part #.
Stay away from oval ported heads, that is what you already have.
 
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