Thinking of upgrading my 04 5.7 345 to a new 6.4 392. $7400 for a brand new one, would it be worth it to you? I would plan on adding a cam, heads, exhaust, and eventually a pro charger. I know theres a lot more to be done than what I listed to put a pro charger but those are what i would start out with

 

I wouldn't, keep your 5.7 and just buy a stroker kit. You can stroke it up to a 6.7 / 410, or just to a 6.4. Check out shop hemi dot com and moes performance