In my opinion it's not worth the hassle. If you're lucky the hood will shave 10 to 12 pounds & the trunklid another 8. Removing the steel bumper cores & bumper shocks in favor of some home made aluminum ones would save 50 pounds at least, maybe more.
Take the door windows, regulators & tracks out, cut out ALL the inner door metal except an inch to attach the door panel & sawzall out the impact braces & you take each door from 80 pounds stock to about 37. Add some tabs & Dzus in some lexan side windows & your still about 40 pounds each.
Lose the carpet & seats & go with plastic or Kirkey seats & 200 plus pounds is history.
The '80 only weighs 2500 pounds or so to begin with so there really isn't too much to lose. Manual brakes & steering, Willwood brakes up front & aluminum skinnies will save 100 more pounds.
Hope this helps....