Value of a 340.....

The vice president of the company I work for has a friend that has 2 340's that were pulled out of the cars in the mid 70's. One is a 1970 and he thinks the other is 1973??? Both are complete from carb to pan ( not sure about exhaust manifolds). Both will need to be gone through.
Any suggestions on what one of those would be worth today?
Thanks in advance, Dennis.