I know the 5.7 will swap where a 4.7 was and the computer can be reused (check he number of connectors,3 or 4 as to compatability) I have a 2004 Durango 5.7 Hemi it is a TIGHT fit in the engine compartment!I thought about headers vs the stock log manifolds,but I don't think they will fit at all.I pulled the blown motor and I'm putting in a new long block.Most time consuming engine R&R I have ever done,and I have done many.Everything is in the way of something else.It is an AWD chassis though,which ads to the mix.I would hope yours is 2wd!
RT