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yes, too rich. before you mess to much id check your plugs to see if you are getting an even built up- could be only one of your carbs is too rich- and if all adjustments look the same, then id check the floats and pin valves- if your pin valves are clogged up they may be getting stuck and letting in way too much gas.- and if your float is bent or otherwise adjusted wrong, again- too much gas can result
they are easy to check, just pop the top off the carbs (on the car ok) and there will be a little reservoir with a small pontoon that float in the gas and when its "full" pushes in a pin valve to stop the flow of more gas into the reservoir.
if they look cruddy id suggest a cap ful of "sea foam" (if you can get it in australia) into the gas (inside the carb) and let it sit overnight- that will dissolve most of the crud and when you start the car it will all get flushed out-
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