And this. I googled it so it must be true!
What year did the 383 come out?
The first 383 was introduced in
1959, but as the raised block. The dimensions on this engine were a bore of 4.030 and a stroke of 3.750 inches. This engine was available with two four-barrel induction and a horsepower rating of 345 @ 5000 rpm.
Mopar Big Block History>