not all that shocking.
i fired up the way back machine and here's one from
@IQ52 with a full run down
[URL]https://www.forabodiesonly.com/mopar/threads/dyno-testing-a-stock-1972-440.249866/[/URL]
here's another that's a little more recent, similar numbers
[URL]https://www.forabodiesonly.com/mopar/threads/low-compression-440-dyno-test.504716/[/URL]
repeat the mantra: the magic is in the heads.