273 4-bbl Hi-PO Engine Appraisel?

I have several 273's laying around and I know that the HP273 was stamped on the block 273-4 and the 273 2 barrel motors were stamped 273-2. Pulled a 273 out of a Barracuda Commando car and it had 273-4. My 67's original 273 was stamped 273-2