340 questions - anybody recognize these pistons?

It's got a wide casting line on it - wouldn't that be forged? Cast crank would be thin. Pistons appear to be afterrmarket - they are 0.030" -will see if I can find any numbers on it. Are the 340's like the 440's where they ran forged cranks in them until mid way through 1972?

I will have to get the rest of it apart to get the rest of the story!

Thanks for the help!!