Hello Scoot,
You will only be able to determine if the pump is not stuck. Remove the side cover and turn the pump and watch each spring and piston assembly move up and down. Remove the rack cover on the end of the pump next and move the acceslerator linkage, the rack should move in both directions about a 1/4". Also check to make sure the WRD slide valve is not stuck.
This will tell you that most of the basics are in order. Unless you actually install it on and engine and run it or set it up on a test bench and meter everything you cannot determine that it is usable.