I would guess 1500-2000 bucks or so for a low end estimate with you doing all the work. Around 500 for a junk yard motor and all the stuff for it. Alt, ps pump, starter... 5-600 for a good wiring harness that you wont be fighting the rest of your life. 500-1000 for miscellaneous stuff like motor mounts, adapters, radiator, fuel pump... Again thats a low end guess.lol It really depends on how patient you are finding deals and how much stuff you get from a junk yard or new. Also if you want to have the engine freshened up before you swap it and all kinds of variables...
91 Laredo, 4.0ho, TF999, Magnaflow exhaust, Yukon rear axles, Spartan Lockers, Posi locker, 3.5 inch springs, 1"MML, 1"BL, 1"shackles, trimmed fenders, raised flares, 35x13.50s.