Help identifying aircraft

[tigercat]

I have recently come across a postcard of an unusual Anerican aircraft and can't work out what it is.

It is a twin pusher aircraft  with a gun position faired into the front of each wing in front of  each engine nacelle with a very large gun in each and side blisters

[pyro-manic]

Bell Airacuda? '30s bomber-killer.

http://en.wikipedia.org/wiki/Bell_Airacuda