Regear $2500
Tires and 17" wheels (x5) $2500
That leaves you with $3000, which you could spend entirely on higher end suspension and throw your spare tire in the back. Or you could get a cheap/used suspension and maybe a rear bumper with tire carrier, if you're lucky. Or re-prioritize front bumper and winch + cheap-out suspension + spare in the back.
Basically, you don't have enough money to outfit your 80 for 37's without compromising in one area or another.
Asking "what lift?" is like asking "what is your favorite color?" 3"- 4" would be appropriate for 37's, aside from that it's all about budget and personal preference. This will also require caster correction and probably a DC front driveshaft. So that's more money you don't have...