Parts and Financial questions

[matchstick321]

Hey guys been a long time since I've posted on here. I've got a question that might seem stupid, but you guys know more than I do! I found in my local Craigslist a 1986 chevy truck http://lewiston.craigslist.org/pts/3307450760.html for $500. Now the questions if I buy it and take what parts I need (Bed, Doors, Tranny and interior parts) And then take the rest to scrap how much money would I actually lose from the deal? and What parts besides the fenders and grill would be interchangable between my 1979 chevy silverado k20 3/4 ton and this 1986 chevy custom deluxe k20 1/2 ton? Any thing you could point out would be Great Thanks!