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That adjusting screw you mention is really not the correct way to adjust slop out of the box, but it will help some. Agree with the above post though. If that screw top is flush with the nut, it is time for a rebuild or replacement.
Ahhh, I missed that little tidbit from the first post that you stated you have an R/T. So it already has a 440 baseplate. And you are dealing with RB intakes. So everything I posted unfortunately does you no good.....
Here is my scribbling from the manifolds I had with their measured heights and how they compare to a stock 383 4 barrel peice. Looks like I measured that the 440 base dropped the aircleaner lid 11/16". Still not enough to fit the RPM intake if that's what you were wondering.
I went through the same thing a few years ago on my 69 Bee. The Performer RPM will not fit. For current production manifolds, a standard Performer, or Weiand Action + will work. I also bought a 440 air cleaner baseplate from PG Classics, that gives you some more room as well. I ran the Weiand...
I never ever use tape on gas line threads. Same reason you are not supposed to use Teflon tape on LP/natural gas piping in your house. A small thread of it can get into the line and cause the valve to stick open.
It is sometimes a bugger to get the feeler gauge down past the bump out. Push down firmly while moving the feeler gauge back and forth. It will go down enough eventually.