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Well, I would hold off on ordering a new carb - maybe a rebuild kit. The loud pops and low revs sounds like a possible timing issue. I 'd pull the distributor cap and check if the rotor "snaps" back after manually rotating it bit...checking the advance springs. I would also check for spark in all cylinders, 1-2-4-3 plug wiring sequence, condition of or change cap and rotor.
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