A 440 casted in 69 would produce 375hp, as long as the original cam, etc are still intake. Prior to 67 they were 365hp if I'm not mistaken. After 67 they built the performance block, granted it was only 10hp more, but heck, 10 is better than 1.

71 marked the decline of the 440 big block power by dropping the hp rating to 370 then in 72 it went down to a measly 280hp.