If it has the V-6, those are great motors.....not that the I-6 isn't, but those V-6 motors run forever! If it is original, unrestored, and has no rust, that is a fair price, depending on over-all condition.

1964 C-30 http://s1179.photobucket.com/albums/x383/autoart3/64%20one%20ton%20dually%20flatbed/