Took another look. What I thought was a radial engine is actually the spinner base and prop.
So, yes, it is a P-40.
On a re-examination of the “head on” photo, I can see you you thought it was a radial engined P-36 “Mohawk.” The right and left cylinder banks of the liquid cooled Allison engine are seen and give the illusion of being radial cylinders. and the chin radiator is totally gone, giving the nose an oval appearance of a radial engined fighter. do a google search for “P-36 Hawk” and you will get dozens of pics of the P-40’s radial engine predecessor.
See also these two wikipedia articles: http://en.wikipedia.org/wiki/Curtiss_P-36_Hawk
http://en.wikipedia.org/wiki/Curtiss_P-40_Warhawk
I first fell in “love” with the P-40 was from watching “God is My Co-pilot” on tv, it seemed to run every few months back in the 1950s on Chicago tv stations; especially on the afternoon matinee movie from 4 to 5:30 pm