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 I was having the same problem when i was using the Nitrous.  I swithed over to a MSD digital 6 and it has full power up to redline now.  Check your igntion componets.  Maybe its time for a new igntion?
 The more probable cuase is the following: the engine might need some more fuel at the hi end.  Before I did the heads/cam it was "runing outta steam" at the top of 4th.  I bought an AFPR and bumped the pressure a bit.  It cured the problem.
 
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				-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
 
-1994 Ranger w/ 427cid windsor (daily beater)
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