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where are you located mate? it wuold be a good idea to get someone to plug in a scan tool like an ecu talk so you can see exactly what the sensors are reading while running.
you dont need an electronic ignition the tb42e is already computer coltroled for the timing and fueling. its only the carby boys that replace the points in there dissys with an electronic ignition setup
other things to check are the thermostat as if its not getting to proper temp it will run rich
my best econ was 13l per 100kms avg being about 20l. currently getting 20-25l per 100km towing 2 tons daily but my tb42e is turbo charged these days