The first one is either a '65 or '66 327 out of a Chevelle, with a 4bbl. Either a "special high performance" 300hp version or a 275hp A.I.R./powerglide. It was built on July 11th at Flint.
The second one has 4 possible combos, from a '65 327 fuelie Vette, to a 69 350/300hp in a full size. It was built on June 23rd at Flint
You can look them up right here:
http://www.nastyz28.com/gm-chevy-cod...s-suffix-5.php
There should be a vin number also on the same pad. That will tell you the year of the engine.