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Get your car to climb up on a chassis dyno and put an A/F sniffer up the exhaust and do some pulls. Bring lots of jets to dial in a good A/F ratio. Make sure your idle circuit is adjusted correctly since it will influence all other fuel circuits. Could very well cure your fat A/F ratio and increase HP and torque in the process. Run the motor at a light cruise at around 2500 rpm and check A/F ratio and adjust the primaries as needed. Then do a full throttle pull and adjust secondaries if needed. Part throttle A/F should be around 14.5-15.0:1 and full throttle a good 12.5-13.0:1 A/F ratio. If you are truly running too rich now you'll see good gains in torque and HP and fuel economy after massaging the carbs A/F ratio.

Bill