Definitely Mopar. Frame rails, rear end, front suspension all looks Mopar. The frame brackets and remains of motor mounts look like V8 stuff. That would mean '51 up Chrysler or '52 up Desoto. Dodge used the sheet metal yoke front mount thru '55. Ray
One other thought......measure the wheelbase. 120" and more would be Desoto and/or Chrysler. Also, check wheel bolt pattern...... 5 x 4 1/2"..Desoto or Chrysler..........5 x 5 1/2"..Chrysler for sure. Ray