Believe what you like, but 290hp from a warmed over 8:1 318 happened for me 30 years ago.
(Well, actually not quite 30 years ago just yet. The date on the dyno sheets is September 1990)
It’s a “been there, done that....... have the stack of dyno sheets to prove it” thing in my book.
View attachment 1715541100
I think if it had an honest 9:1cr and a real cam it would have easily been about 1hp/ci.
It was .040 over, so it was 324.5ci.