Cheap 5.7 Harness & ECM????

I've been searching the net for a simple wiring harness and ECM.
I came across this. Seams pretty cheap, but probably not very tunable.
I might go for this. I bought a 2004 5.7 4x4 Ram truck minus the cab (previous owner needed it for a roll over), it has all the harnesses, steeing colunm, trans, transfer case ond diffs. Once i get it running i should be able to sell everything I don't need.
I only paid $600 so I think it's a fairly good deal.

http://www.efisource.com/shop/ms3-gen3-hemi-plug-play-gold-box/

Let me know your thoughts.