Or it's really a TAC out of a 73/4 Blazer. May be rebuilt/replaced.
F = Flint
07 = month = July
05 = day
TAC = 1973, 1974 Blazer/Jimmy 250
Look for a casting date code to find the year. These are V8 locatins, but the code is the same.
http://www.mortec.com/location.htm
