Sounds like a great project. I suggest you post pictures! I'll help you find any information I can so ask all the questions you like. I don't know how much if any our trucks are similer yours being a 1979 "K" and mine being a 1981 "C". Good luck with your truck.
Jeff
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning