70 318 with 340 internals/Cyl Head

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I think you're wrong on 67 being the only year the 318 had a forged crank. I have a 68 out in the garage that has a forged crank.

Never say never with Ma MOPAR. They used them in trucks later also, that is why I said cars. But if you buy a 1970 car 318 for a forged crank, you will most likely be disappointed.