a lot of the orig first run blocks were dam close , my 1966 440 block required .002 to square it and bring the deck into proper heigth ...
the 68 hemi block I used to own was perfect to factory specs ...
Good to know, the spec I saw was for the late 60s. Do you know what car your 440 was out of? They might have spec's tighter tolerances for Imperials, Chryslers and 426 Hemis but didn't care as much for the high-volume engines for Dodge and Plymouth cars.