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

Chrysler's own 1970 Dart advertising.
View attachment 1716391856
6000 RPM for under 3gs.
Apologies for the flash glare, it's in a plastic bag to protect it, and I didn't want to take it out.
Ill give 3k right now for one
I paid $2500 for my loaded 69 gt dart 273 in 83
I guess they didn't deprecate that much back then