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Where is fuel coming out of left manifold? It should be completely sealed. Any petrol should remain internal. If it escapes, there is additional leak such as crack in manifold or loose hose-clamps.
Verify tank is clear of rust.
And you have inline fuel-filter between petcock and carbs.
Any bit of grit will jam petcock open and floats open.
With emissions disconnected, what did you do with hoses going to tank?
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