to me the roof line looks 1940 not 39. 39 dodges have a helemt looking roof like a 40 chevy,

and the hood release on the engine cover side looks chrysler in this pic,,,

also to put a mustang II cross member in a 39 frame,, you have to wack off the front stub,,the 39 and 40 front frame wont except a mustang cross member, but looks like a solid car and i wouldnt pass it up if its a decent car and deal, i havea 40 buss coupe 241 hemi a friend has a 37 with a 413