Disappointing dyno results

Phreakish said

Jetting is never correct unless it's been tweaked for current conditions. Yes, that's over over-statement, but it would not be abnormal to see AFR vary from nominal when the cam isn't exactly stock and the exhaust isn't stock, and the air filter is removed, etc. Every carb needs fine tuned to conditions and equipment.
It's a shame the dyno guy doesn't have some AVS parts on-hand to help out, but it sounds like you can rule out the carb as an issue with the 600 holley.

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AVS strip kits are long discontinued and I doubt many shops have those parts laying around since most people don't build performance engine with those OE carbs. The jets from an AFB do interchange though. But the 3-step rods and springs are unique to AVS’s.

BTW, 1968 AVS's have the idle adjustment screws blocked off and have center adjustment. They're sorta PITA. He said this might be the carb he’s using.

Was the Holley 600 ran after the plug wire issue corrected? If so, was that carb evaluated if it needed jet changes?