How much? Factory duallie stakebed from 67-68 C30

[botboy]

Hi guys, my sisters friend has a 67 or 68 C/30 2WD with a 292/4 on floor in it, planning on buying it, pulling the stakebed and replacing it with a dovetail (so I can use it for hauling cars/light trucks and pulling a 5th wheel trailer)

How much can I reasonably expect to get for this stakebed? Anyone in the midwest who would be interested in it? Can deliver. Picking up the C30 as soon as my '58 Apache is sold. Will take $650 for the truck, runs and drives!