look at the mercedes 617 thread of 4btswaps.com, there are a lot of people doing this and many of them are there. I believe they have determined the 617 is internally balanced, so the flywheel is round, but the expert is there, not me. If your rear end ratio is high enough to use the high rpm of the mercedes effectively, you shouldn't need a bigger clutch. I'm going to use 4.1 or 4.27:1 in my ford f150, but 9" ford rear ends have drag gears available that go all the way to 5.6:1. I'm going to use the mercedes 722 auto transmission and buy a spicer adapter for the driveshaft end. See cell's thread on this site about that.

__________________
'80 240D biege "Mercey Bird"
'80 240D light blue "Slug"
'80 300SD dark blue "Theodin"