1972 413 Engine Complete

I have had a few 72/3 dated engines with the thicker balancer like that ....that don't look like a cast crank balancer to me.

I bet its an HP motor or has the six pack rods ....the heavier rods take the thicker balancer and changes things on the bottom end for flywheels and related.

check the ID boss to the right of the distributor and see if there any markings like "HP2" or anything else