If you do buy the car:
Replace every hydraulic hose on the ABC suspension now before they fail and leave you stranded or cause you to grenade the tandem pump if you decide to drive with a broken hose.
Install new accumulators.
If the coil packs have not been replaced, go ahead and start looking for a set.
Replace the front upper idler pulley. It is plastic and will fail.
And the most important item.
Get an ECU/TCU tune from Speedriven. You will smile from ear to ear with an extra 110+hp for $1290. Speedriven also has there 800 hp kit on sale for $4995.
Speedriven V12 Kits - MBWorld.org Forums