My 5.7 was a VVT engine (2011) your is not (2008 and older= non vvt).

I would have to look again butt I think tone wheels are different, cam would need to be locked, timing cover is different and yours wont fit a 6.4, I don't know if there is one that would work on a 6.4 with your accessories. AC compressor was relocated on trucks. Your intake will have a significant mismatch on the big 6.4 ports. It could be done but it is not such a straight forward swap as a 6.1 anybody who can swap out a 5.7 for a 5.7 could swap a 6.1 in place of an early 5.7. If you can swap late 5.7s you can swap in a 6.4 just as easy. Maybe we should call them gen 3.0 and gen 3.1 hemis? Like they do with computer programs...