So whats this kind of swap cost to do???

If we are going to compare, let's compare apples and apples. What would it cost you to buy a crate 360 ? Mopar performance sells a 390hp 360 for 5K and that's without carb, dist, alt, wires, etc. So by the time your done, you still have about the same money invested, and I doubt that the 360 will get the mileage of the Hemi. I think it was Glendora Dodge in CA. selling production 2008 hemi's right off the assembly line (that's what I have except mine is an 05) for under 4k brand new. Of course you still need the accessories. IMO it is more a personal choice than a financial one, New School vs Old School.