340 4 barrel and 340 6 barrel: were they really UNDERrated?

Bewy said
273,
Yes 295 hp for the 340, as it comes in the car.

So in dyno trim (gross hp) it would be more than 295 hp, maybe not all the way to 320 hp but a lot closer.

To me I don't overly care what a stock 340 makes, but every sense I have says it's a least 300 hp gross and a 230 hp 318 doesn't make over 200 hp.