Might want to check craigslist or ebay and see what these things will sell for in your area, but I listed my humble opinion in RED below!!!
GMC grill, has a couple dings here and there
($50-$75)
passenger (good condition)
(if completely rust free and dent free $150...if not $50)(These fenders can be used for 68 chevy trucks too) and drivers fender( dented, maybe scrap?)
($30-$40).
passenger and drivers doors.
(Rusted on bottom? If so $50 each, if not $150 each)
vent windows
(if good $50-$75) and reg windows non tinted.
front axle and rear axles.
leafsprings
gmc tailgate, looks great but it seems to be bowed
($75-$100 if bowed).
front bumper. has some dents.
($50-$75)
power steering gearbox
(if good $60-$75)
auto column, non tilt
($75-$100)
seems to have a hand e brake?
($25)
rear slider with great glass
($100)
GMC hood
(looks like it can be used for 67-68 chevy trucks too...if in good shape $100)
an excellent seat, no rips or anything it looks new.
($100)