It could be one of three:

1955 FC 265 Powerglide, a/c - - car
1957 FC 283 Powerglide - 4 car
1969 FC 327 tur hydro trans. 235 2 B F

The F means Flint

Look for the block casting number or the casting date on the drivers side forward of bellhousing. Date consists of a letter for the month, two digits for the day and the last digit is the last digit of the model year G049 is July 4th

(it must be true, I read it on the internet)