Try to contact every mercedes tuning shop in your area. or anyplace that does drag cars, too see if they are up for some custom work (ie headers, intake, manifold intercooler piping) the best bet is going to be to drop the compresion, have a custom turbo mainfold made, run a stand alone fuel management. Along with all other hardware to go with the upgrades (forged pistons, cams... ect)

I have to disagree about runing a jap engine in the car not being posible. their are ford powered mercedes runing around as well as supra powered nissans and thousands of other oddball cars. almost anything can be done these days.

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MPL
Son of mplafleur (forum member)
1980 240D (dead)
1988 mazda rx-7 250whp@10psi needs dyno of 15psi