The 5.0 DOHC V8 is reportedly (per www.mbcoupes.com) the perfect upgrade motor for a W126 series car: just make sure you get all the electronics and wiring intact. If you could get this car for $4K you could probably part out the rest of the car and break close to even...

Maybe...

Cheers!

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'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435