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is your '04 the early 6.0, I think if its a build date before mid september, or the later model '04? If its the early one, it wont have the dummy plugs and the stand pipes are different but they are updated.
there is an air test where you pressurerize the system via the icp port and listen for air either under the valve covers, turbo drain tube port or oil filter housing. depending on where you hear the air escaping whould hopfully narrow down where the leak is. There are writeups I have seen on this site that go into more detail that would probably give you more info.
2005 F-350 XLT long bed 4x4, 4" turbo back diamond eye exhaust, ARP studs with Ford head gaskets, SCT X3, blue spring mod, stc fitting update, updated stand pipes and dummy plugs, Performance Machine: EGR delete, oil cooler, coolant filter.
Next upgrade: pillar gauges