How to tell what a 360 originally came from ?

Musick73dart said
Hi it was my question everywhere i go everything jus pops up for the car vin but cant find anything on what the numbers on the block mean i have decoded the date i know its a 1973 block but i found a number down on the back of the motor and it looked like 3m360R4471 the casting # 3418496-4-360 and another question on the crank the #3418640-2 what is the (2) mean

What info are you looking for exactly ? All 360s had cast cranks and the same rods. They were all 8-8.5 compression. All had 1.88 intake and 1.60 exhaust valves.

If it was a 4bbl motor (73 casting could be from a 74 Duster or Barracuda) It would have the 340 cam, and a windage tray I believe.