Yes, I heard of a couple high compression 340s in 72 cars but never seen 1 in person. But I have seen atleast 20 low compression 340s with steel cranks in 72 cars. In fact I was one of the lucky ones to own a 72 340 swinger in the early 80s but I didn’t know that at the time. Sadly it has been sitting under a tarp in a garage ever since I sold it in the early 80s. It was pretty decent shape then but no idea what it is like now. Kim