About the only way would be to go with longer and stiffer springs, or use a spacer with the original springs. I won't say it would work, but you might be able to use a 2wd lift for a '73-'87 truck in the front. Just out of curiosity, why do you want such a large tire on a 2wd truck? It will make steering hard, especially without power assist, plus the extra weight will effect the brakes, too. And don't forget, it will change the overall geaing, so if it's too high, you may see a drop in performance, especially in town.
