Are you sure the radiator frame was cut? i think the radiator they put in just fit within the existing flange. I'm just going by picture because I don't have it in front of me. Did the original radiator end at the flange closest to the engine or slide down into the channels?
what do you mean by later engine? My understanding is this is a 54 engine in a 54 truck. It's actually T54XB so i think it's original to a 3800.
what do you mean by water pump in original location? is mine modified?
Tj