Well, according to Comp cams, you do, but that's news to me. The cams are physically interchangeable. The cam bearing journals are exactly the same size for every Ford 5.0 ever made. The F-150 had a roller block starting in 1988, but they stuffed a flat tappet cam in there until 1992. Worked fine. I've seen cams swapped dozens of times, and the only problem that ever arises is when the distributor gear is not matched.
Take care,
-Chris
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