If it is a modern Olds motor, the numbers will be on top of the water pump shelf with either a large number or large letter. Won't tell the year, but will tell the Cu.In.
49: 8A1001 - 8A193864 H Prefix = Hydramatic trans 50: 8A194001 - 8A568689 H Prefix = Hydramatic trans 51: 8C1001 - 8C287312 B Prefix = Standard shift trans 52: 8R1001 - 8R214478 53: R215001 - R549482 54: V1001 - V355083 55: V400001 - V983275 56: A001001 - A385513