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If possible you might try to pick up some heat from the engine to preheat the air going into the carburetor. The early Nissan-Datsun 240Zs with the Mikuni (SU type) carbs had a preheat tube connecting the air cleaner to the exhaust manifold heat shield. The manually adjustable flap was marked "winter" and "summer".
With everything properly tuned and mixture adjusted properly, the variable venturi carbs
are notorious for severe hesitation and driveability issues. Set the flap to winter position=problem solved. You could feel the air filter housing get almost too hot to touch when it was working.
More heat better fuel atomization, more efficient, better driveability.
regards
mech
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