"F" is the series (1970), as Chrysler started over in 1965 with "A" series - this is NOT what body it came from, but yet another way to gauge the model year in which the engine was used.
69CoronetR/T is correct about the "C" in the engine stamping. This represents the last eight characters of the VIN, so the "0" means 1970. the "C" is the plant where the CAR was built (Jefferson Ave, Detroit), and the last six are the sequential build number of the car it came from. So, it came from either a 1970 Chrysler or an Imperial. Six-Pak parts in this engine are highly unlikely, unless the VIN matches to a 1970 Chrysler 300-Hurst, perhaps; but I'm pretty sure the 440 T-N-T engine did not have any Six-Pak internals at all.
Sounds like you have a good 440, regardless of what it came out of originally. Remember, 47 years have passed, so any number of things may have been done on this engine during that time.
