Tim,

http://www.1954advance-design.com/chev-specs/1958-c-ser.pdf

F072IA
F = Flint, MI plant
07 = 7th month = July
21 = 21st day
A = regular production car 235 with manual transmission (hydraulic lifters)

It could be a 58-62 engine.

How did you figure 1960?

I think you'd need block and head date casting codes to determine the date. Locations of date codes are shown here.