yes, add the poly 318 to that too. PAW used to sell poly 318 forged cranks drilled and balanced to "340 forged" specs. just be careful on the hub register size.
This has bit several people, including me a few decades ago. I can never remember the change-over year from small to big - '66 or '67?
Isn't the crank on the right shown in MAX1196's photo a forged 318 truck crank? I thought they didn't have a bored journal, and were said to be stronger, but 340 cranks did.