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.