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Below are some good links on decoding the VIN of your Ford. In summary ... if your car's VIN starts with an M, then it came out of the factory with a 292 4bbl.
The standard V8 in '55-56 was a 272 - 2bbl. and the 292 - 4bbl. was an option, called the "Thunderbird V8".
http://www.vanpeltsales.com/FH_web/f...9VINdecode.htm
http://www.vanpeltsales.com/FH_web/f...49-59partA.htm