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Is there a strong blue ignition spark? Inspect all of the fuel hoses for kinks or collapsing then check fuel pump draw, pressure and volume. Any possibility that someone installed a redundant fuel filter? If so, replace it. Fuel filters have a marked direction of flow - make sure it is (they are) installed correctly. Verify the carburetor float level is correctly adjusted. Is the 'gurgle' originating from the exhaust? Check for excessive exhaust backpressure. Temporarily disconnect the exhaust close to the engine if you need to - but don't do this at night in a "quiet" neighborhood - lol. Does the transmission downshift with rapid throttle opening below about 40 MPH? Recheck the detent cable adjustment. Is the transmission full of fluid? Verify that the transmission vacuum modulator valve is receiving full manifold vacuum and that there is no evidence of ATF dripping from the modulator valve nipple or its vacuum hose when the hose is temporarily removed from the valve for inspection.