socket size for a small block mopar crank shaft bolt?

Krooser said
I had to revise a bolt head last week when a SBC intake bolt was rusted between a 9/16 and 1/2". Some input from my heat wrench made it a 14mm and I pounded on the correct socket!

At least you did not have a round head bolt on a 318 LA, it was not machined for the hex.