Need help with this 340 block id.

OldmanRick said
The two 10k calendar #'s look to be Feb 72' and Sept 72'. What's the balancer look like? Probably the larger for a cast crank, especially with the 3B on the vin. Likely a late 72' build.

That said, what a mess for stampings, thanks Ma ... :)

Wow, ya'll are spot on, thanks for the information. This morning I took a partial pic of the balancer and the tale tale shape.... yep a cast crank balancer. I thought all these years it to be a forged steel crank engine.