Goos score on that truck!..My '82 K2500 is a close cousin of yours,it has the 6.2/TH400 and I got mine cheap too,paid 350 bucks for it back in '03,got it not running and someone had just installed a rebuilt tranny and a salvage yard 80K motor in it,but couldn't get it to start,so they were disgusted with it..mine is maroon,with a visor and a 8' stepside bed,which led my friends to nickname it "Fugly"..but it has plowed my driveway faithfully for 7 years without and major malfunctions!..
I think lots of folks blame the injector pump when some other problem is what thge real trouble is--so many times I've seen trucks that someone gave up on too soon,after hearing that costly pump might be whats keeping it from running...one guy I know got a real nice 1 ton dump 4x4 with a 6.2 ,a 1986,for 250 bucks,because the former owner said "it needs a new injector pump,all the injectors,and maybe a fuel tank"...he got it home on a trailer,we had it running 15 minutes later--the main feed line to the fuel tank and filter had rotted in half!..a hunk of rubber hose fixed that fast..he's been offered 1800 bucks for it already,but doesn't want to part with it now!..
It's getting rare to find ANy old GM trucks here now,and especially the diesels,they didn't sell too many of them here,and the few youdo see for sale usually are priced high,or are so whipped they are not worth having,and junkyards scrap or cannibalize them quickly...I got a good deal on my '85 Suburban,paid 400 for it,but it needs a tranny and numerous other things,it aint a rotbox,but has some areas that need patching up too...it would sell for 1500+ otherwise here,a lot of folks like diesel Suburban's and 4wd ones,and they are getting scarce ..