my 364 is not firing in cylinders 2 and 4. i'm sort of at a loss. compression is good, i put in new wires, plugs and rotor. plenty of spark coming out of the wires, the plugs are firing and gapped right. when run, if you pull the wires for 2 and 4 there is no difference. the carb has been rebuilt. the valves do not seem to stick or be bent. the passenger bank is firing clean, but on the driver side the exhaust smells a lot like gas. i'm sort of at a loss. any help?