Casting numbers would be raised, but I'm guessing the block numbers you list are stamped. 4D1136630 looks like the stamped engine serial, which would match the serial number of the donor car and 389229 looks like the stamped engine sequential number.
4 = Series 40/Special (Specials had a 2 bbl carb)
D = 1957 model year
1 = built at Flint MI
136630 = sequential number, range for Flint was 000989 to 149460