Boy, you are really just covering up a pretty major issue......OIL PRESSURE!
Before you tear into this thing you should throw an oil pressure gauge on it and see whats happening there. Hot oil pressure (EOT @200*) should be at least 25 psi, but in my opinion - I think 30 psi should be the absolute minimum. If the pressure is low you will just be throwing money away putting these parts into a motor that is on its way out.
If I had one of these trucks I might consider loosing the phasers, but wouldnt dare do it to cover up something more serious.
Good Luck!
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