V-8 - Overhead valves
Cast iron block
Displacement: 390 cubic inches
Bore and stroke: 4.00 x 3.875 inches
Compression ratio: 10.5:1
Horsepower: 325 @ 4800 rpm
Five main bearings
Hydraulic valve lifters
Carburetion: Rochester four-barrel model 710930.
NOTE:
Although neither engine displacement or output changed, the 1963 Cadillac V-8 was completely redesigned.
Quieter, smoother and more efficient, the new motor was one-inch lower, four inches narrower and 1-1/4 inches shorter than the 1962 V-8.
It was also some 82 pounds lighter, due to the use of aluminum accessory drives.
http://www.100megsfree4.com/cadillac/cad1960/cad63d.htm