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The answer to your question can be found in the Lime Book which is posted in the "Sticky" section. I was bored, so I looked it up for you.
T0209CNV is a Tonawanda block assembled February 9, 1970. It is a 350cu in/ 250hp, two barrel, TH350 auto from a passenger car.
T0220GF is a Tonawanda block assembled February 20, ??? Could be any of the ones listed below...didn't come out of a Corvette.
GF 55 265 162 2B,3S,AC PA,TR
GF 56 265 162 2B,3S,AC PA,TR
GF 57 283 250 FI,TG PA
GF 65 283 195 2B,PG PA
GF 66 283 195 2B,PG PA
GF 67 283 195 2B,PG PA
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.