ignore my power steering comment, I had 5.7 1500 donor on the brain.
Yes I've done a few G3 old dodge truck swaps all 4x2s so far, so I don't know how this will translate over to 4x4
, one thing you'll have to keep in mind is the G3 Hemis are wider than a 440 , I think it's an inch ,
On a 4x2 ,the P-side valve cover will be about an Inch from the AC/Heater box....so no changing valve cover gaskets if they leak. and the Driver side gets cozy with the older brake booster.

Cam ,speed logix still has them for $66, I've heard some local dealers want as much as 10% off MSRP
http://www.speedlogixstore.com/product-p/m-oem-392c.htm

If your donor 6.4 doesn't have the oil filter adaptor......get it.

Not a 4x4 but it's being done yet this year(hopefully)
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2479248/ramcharger.html#Post2479248


BGE Vs SRT the guys above me already went through the difference's BUT if you ever want to go Big time boosted, leave the SRT392/Apache heads to some one else, the BGE and Hellcat head is the one for boost.