Dyno testing a stock(?) 1972 440

On the Engine Masters show on Motor Trend they did a dyno test of a motorhome 440, IIRC Steve Dulcich chose one of the Whiplash/Thumpr-type cams because the specs worked out for a super-low-compression engine with stock heads. Seems like he was right that thing put out some serious power with just a cam, headers, intake and carb, I want to say a bit over 400 HP and 470 lb-ft? With a compression ratio in the 7's...