de-code engine decode

Researching my small block out of my 67, I narrowed it down to out of a 75 C-10 or 2500, I just want to make sure I'm not overlooking something. Back of block: GM 3970010 Front of block: 05F148105 V0310TYX Imprint near oil filter: (good for anything?) 371 386 83 N Thanks in advance...