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What type of AIR FILTER are you trying to run through ? ... if any.



K&N 14x3, I could do a run up to 4000 without one to eliminate that as a variable.



A 14x3 on a 500 inch motor ? ....

Yes .. try a shot WITHOUT an filter. Or at least double-stack them.



If I double stack them I will have to pull off the hood, as it is I have maybe 1/4" clearence between the lid and the hood. I'll do a run without but if thats the issue I don't know how to get more air filter under there.



K&N makes a filter lid http://www.knfilters.com/universal/X-stream.htm I have a spare HR 220 what fuel doesn't leak out might help your possible fuel starvation issue