360 Came With A Forged Crank

Herb McCandless told me not to worry about a cast 360 crank. Said they were plenty strong.

Exactly. They were made out of the same material as the 351 Cleveland cranks. Nodular cast iron. Much stronger than plain old cast iron. The Clevelands routinely spun 9500 on the NASCAR tracks back in the day, so the stock 360 cranks are just fine.