The 350 emblem doesn't refer to the engine or engine size. It's a 350 "series" truck.
I *think* it's also called a 2-ton, but somehow I often get that wrong.
There's a Low Cab Forward version of a 350, but I think the "c" in your VIN means it is a conventional. And, yours should have a ~155" wheelbase.
I also think there is an "8" in the serial if it came with the V8, so the sixer is what your truck rolled off the line with.
Probably has a 6.17 rear end.
Those are my guesses.
