Early 72 340, is this one of the de-tuned ones?

So I would say by vin number on side of block on boss and the fact it was poured after Nov 1971 it was originally a lower HP block with the lighter compression.
My Sept 1971 build date - 1972 Demon 340 has a steel crank and the left over 71' higher compression pistons. Last 6 are 162797
I was told some time around Nov 1971 is when they made that change BUT I was also told some engines as late as Jan 1972 had the same components as the earlier 1971 engines. Chrysler trying to use up engines before the mandatory emissions swap over. Can anyone else confirm or deny that one?