B = Feb
4 = 4 th
9 = 1959

B = Feb
15 = 15 th
0 = 60

3836848 = 1956-1963 235
3769716 = 1958-1963 235 (could be car or truck engine)

The car engine would have come from the factory with hydraulic lifters
The truck engine would have come from the factory with mechanical lifters

The Engine serial number would ID car or truck engine.