The pump was optioned for carbs that don't run a direct return to the fuel tank. That port hasn't been drilled out or tapped on the fuel pump. If the choke is open cold, the auto choke has failed. It'll run without the choke function but starting it cold will be a drag. Is your carb an all alloy Mikuni Solex? This is going to sound like the voice of doom but you are going to have a problem finding another one of those carbs. You can swap to a later one, but to save you headaches try to find one from an 85 or earlier as the later Mikuni has all of these control solenoids on it that will be a nightmare to get operational on your engine. Now may be the time to think about a Weber swap.
I built a tricked up Solex carb and gave it to a friend - it's probably a desk ornament now
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