I would be very interested in a solution too.
I have the same problem on my 440,but have tried almost everything listed and more,3-cams/gears/carbs/ignition-3-of them/exhaust/timing /springs/fuel-pumps/shim-rockers......whats left?
Heads and a lighter car

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70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!