Definitely not from an E32 750iL (long version) onto an E34 V8, which is even shorter than the standard version E32.
Too long
V12 connections against V8 connections
diamters are different
Have a look here, this is the exhaust from an E32 Alpina B12. Do you think that will fit?
http://www.bimmerboard.com/forums/posts/309930/