Hi, new here. I have a 57 F250 and I'm trying to figure out if it's numbers matching. according to the VIN number on the door (F25K7R34935) it is equipped with a 272 Y block. The engine casting number is B5AE 6015 A. according to numerous online sources this is a 272 "replacement may have been used for marine or fleet use". I don't know if this matters but the intake manifold has the numbers ECW9425-B cast into it. I'm wondering if this is indeed the original engine for this truck.