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I would start by confirming your ignition timing and make sure you have no vacuum leaks. 0.02...

Of the choices provided, for the money, install the Holley 850 HP. Perfect fit for your combo and carb parts are at most Auto Zone type stores if you ever get in a bind and need a small part for it... 0.02

I had the same set-up on my old 426. Worked great. That would be my recommendation. Two - 660 center squirters....:glasses7:

A 750 Holley isn't too big for a 340. Remember the TQ was rated higher than that. Also the factory also offered the 6-pak set up which was more than either of the previous carbs. They key is controlling the timing and opening rate of the secondaries........