The nose was so long because the engine drove a huge propeller. Elevating the prop is also why they gave the Corsair inverted gull wings.
Agreed, but another reason why the nose looks so long is because the cockpit was moved rearward so the main fuselage fuel tank could be installed directly over the center of gravity, lessening trim changes as fuel was consumed.
The prop and gull wing fix are a separate issue. There is a huge amount of super charger systems behind the engine and the main fuel tank is in front of the pilot.