Your block is a 1955 Second Series
0697170 = unit number starting with 0001001
F = Flint Plant
255 = Second Series 1955
YA...you need to look at these letters again, could be XA, MA, DA, BA or PA.
Block Casting Numbers are found right above the oil pan on the front right side inside a concaved area. That number will help ID what you have...
Mike B
