@yellow rose , IIRC the transition took place mid-year 1972. My first '72 was built in October, which may explain why it left with the cast crank an 1.88 J-heads.
From looking at the book (I need to dig out my older book because I trust it more) it seems that’s what Chrysler did. Someone else pointed out in 72 the sticks got the forged cranks and the automatics got cast cranks. All very plausible.
My 72 came through with the 10.5:1 pistons and 2.02 valves. I was the second owner so I know it wasn’t touched.
I kick myself every day for what I did to that car. Just stupid.