looks like a:
1964 impala 2dr sport coupe
Blue 2 tone with white top, blue interior
Flint engine assembled Oct 4th 1964, 327 300hp with manual transmission
125730 pad stamp shows it is the original engine for the car (if it is not a re-stamp)
St louis plant
There should be something like a 10B, 10C, or 10D above the style number also for the final assebly date.
Obviously the tri-power is not factory but it sure looks cool
With Air and a few other options!