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

I just looked up the Vette #'s what I found was 230 hp @ 4000 rpm and 330 lbs-ft @ 3200 rpms, she definitely ain't a revver lol Hard to believe what use to pass as muscle/sport car numbers and people think you can't pep up a 318, the bar has been pretty low for most of history a 5.2l magnum is rated 230 hp @ 4200 rpm.
Yet was leaps and bounds above the 84
Tuned port was the way back to hp
Before that in the 80s nobody had hp
She seen a lot of 5500rpms