F715H ( here is code information)
Flint, Mi
7 = July
15 = 15th
H = 3100-3800 235 (A, AD, or B would indicate a car engine)

Where did you get the ID information on your engine?

G107
G = July
10 = 10th
7 = 1957

Here are locations of most of the useful codes on the head and block.

Post both the head and block date casting codes. They should be dates that are fairly close in time to each other.