I'm pretty sure the V8 gears will not fit in a 6 cyl axle housing. I think Gael has done some experimenting along those lines-maybe he will chime in.
BTW-you will REALLY notice a reduction in acceleration with the 3.27 gears. I went from 3.69 to 3.27 and noticed a difference.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT