[W2zero]

Unless someone else put an HO motor in there it is the generic 5.0 roller motor. The first tipoff is.....which side is the throttle body on? The HO always had the TB on the passenger side. The only other factory application for the HO was on the Lincoln Mk Vlll .

Are you sticking with the injection or switching it over to carbureter? The heads on the generic 5.0 are the E6SE models and they are not a performance head. You may wish to upgrade to the E7TE truck heads like the HO cars had or there are a veritable plethora of aftermarket heads. Explorer heads are interesting as well but the differing spark plug angle is a problem with some headers.