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As QC alludes to, you'll need to deal with the EFI.. You could find a way to tune your original EFI to new motor or convert to a later Delphi system. You will need the primary drive and starter off the later motor/tranny. You need to update the exhaust system, probably change a bracket or 2.
If I remember correctly the front motor mount was changed at some point. Maybe 09? If so now you're fabricating on the frame to make it work
Rebuilding the current motor would be the path of least resistance.
The front mount is different but they did it by changing the bracket and not the mount on the case.. M8 got a big change, On thing I should note is that the engine/trans/primary needs to come out of a 2012 bagger. Dyna / softail won't fit.
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