A833 Factory Paint Markings

Ink Stamped Numbers for E-Bodies
(Mostly found in Light Blue Ink)
696 = 1970 318 4 Speed
696 = 1970 340 4 Speed (4 Barrel)
789 = 1970 340 4 Speed (Six Pack)
675 = 1970 383 4 Speed
677 = 1970 426 4 Speed (Hemi)
677 = 1970 440 4 Speed
753 = 1971 318 4 Speed
753 = 1971 340 4 Speed (4 Barrel) early models?
757 = 1971 340 4 Speed (4 Barrel) later models?
755 = 1971 426 4 Speed (Hemi)
755 = 1971 440 4 Speed
757 = 1972 340 4 Speed (4 Barrel)
804 = 1973 318 4 Speed
804 = 1973 340 4 Speed (4 Barrel)
416 = 1974 360 4 Speed (4 Barrel

This probably won't help, but it implies that the paint color might be model (in this case E body) specific.
Credit to Cuda Cody (I think ebody.org) for these, I'll inquire if he makes A Body stencils.