383 engine identification ?

only once build date is cast no one can f that up. then on any as a mech can tell they on b and rb blocks r stamped on a ….. a …. pad at the dist u know were the dist is that is a place that has a cap and wires there is a flat spot on B AND RB BLOCKS. with engine size and a o a letter for year. don't insult mopar! sale it.