Speedster stalls on Acceleration

[miff]

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I am running duel model B carburetors, mechanical ignition advance, 12 V system, electric fuel pump ,tank is in the rear. Vehicle starts fine when you go to accelerate a little bit it’ll do fine. You put your foot in it and it stalls And then starts to catch up.You can accelerate slowly and it keeps up but it has no real power. I know there is no fuel restriction. Is there’s a timing issue? I have re-time this thing till I’m blue in the face. Replace the distributor with a new one with all new internal parts and wires .Replace the coil ,condenser. Oh I also replaced the fuel pump. The car Ran great last summer. Taken the gas tank out It was clean no Debris ,has new fuel. The carburetors were recently rebuilt. Replaced the Intake manifold gaskets. For some reason I can’t put my finger on it but I still think it’s in the timing. Could the timing gear be going bad ? That I haven’t checked yet. At a loss I’m at a loss