Stang88j
I don't claim to be an expert by any means and I really hate to hear that your car is not 'right' yet. Here's my 2 cents.
Your original post stated that "out of the blue it would not rev over 5800" so the valve timing was not the source of that problem.
I suggest going back to the basics. It only takes 1 or 2 plug wires and/or plugs to make a V-8 run like crap at high RPM. Drop 1 cylinder @ 5000 rpm is like running a V-6.
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Steve