I've done that swap on my E30 Touring
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The following pages detail the installation of the M30 3.5L engine into the e30 chassis.
The designation "M30" refers to BMW's "Big Six" engines, those that were installed in the 5-, 6- and 7-Series. True to the motto, "Nothing can make up for displacement ..." the "Big Six" is put into the small 3-Series. The result is an amazingly powerful driving experience
http://www.e30.de/335i/00.htm