Joey-
May I suggest you read the CR posting rules to avoid wrath, the sign off request in particular.
Regarding you cranks, standard issue with the Competition G.S. in 1977/78. Having mismatched date codes probably decreases the value as most assume that a mismatch means a problem in the mechanical history, as it is a Raleigh, I am sure date codes were not the issue, building bikes quickly was. An assembly line worker just pulled the required part.
The condition of these detracts as well, the earlier steel arm Gran Sport cranks of similar form factor regarding the three arm design appear to be more sought after.
No estimate as to value, for that ebay is very useful.
John Jorgensen
Torrance Ca USA