Wow, This sounds like a reality show, so much drama here over some mods.
Everyone has great expatiations, but the gains that have been seen sound about right for the work that was done. I speak from experience, having built spec engines with minimal modifications allowed by SCCA. Of cause freeing up the exhaust will help with increase the volumetric efficiency gain in cleaning up the intake. You may want to check the fuel delivery system, fuel pressure, for you lean out issue.
I'm interested to see how this turns out because this has become my winter project on my street Z, I have a spare upper which I just finished cleaning up, next is the lower once I find one on the salvage market.
Have a good day
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