You mean the XP-56, CC? All these numbers get confusing...
There were three aircraft competing for the high speed intercept contract.
Vultee XP-54 Swoose Goose
Curtiss XP-55 Ascender
Northrop XP-56 Black Bullet
I already posted a pic of the XP-55, here are pics of the XP-56 and the XP-54. All of them competing for the same contract, all of them unusual configurations.