Hi Art,
2511 runs a .030 over Cleveland, Performer, Holley 670, a dropped Moroso cleaner that makes the air work to get down the carb throat, and the big Ansa GTS headers/mufflers. My cam is very mild compared to yours, but my chassis dyno had HP climbing to 292 at about 6150 until it dropped off like a rock.
What size is that Big Bore choking your exhaust down to? Primaries?
Sounds like air flow issues - intake/exhaust/both?
Larry
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