That's the main gas flow adjustment, the other pic that is circled is to fine tune your gas , back it out two flats will make it richer,
Always mark where you started , You could put a kit through your converter. Bleed the air from the top hose on convertor
, in fact park nose up and bleed whole water system, invert a cut off coke bottle into radiator to raise water level.
Replace all your "TEES" with "Y" this will stop a lot of cavition and just makes things more efficient




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