Probally some hot rodder took the time to do that work, not a UAW worker I had a 1968 426 street hemi intake that had some mild deburring at the edge of the intake ports to head mating surfaces in most of the intake runners, nothing as deep or in as far as yours are I've seen a lot of stock Mopar intake, BB, Hemi and SB that had a lot worse mismatched intake runners to head port size than yours look like, no deburring or gasket matching on them