article from 2017... How Bad Did Mopar’s 340 beat Ford & Chevy?

Reminds me of an interview I read with one of the dyno techs from Chrysler in the 60s and 70s, he claimed that he had never seen a 340 make less than 320 hp.
I believe that. I was always curious how a chev 350/300 with less compression, less heads and less camshaft less intake would beat out thee 340
Insurance reasons??