550hp in a Gen 3 Hemi

I'm considering a gen3 swap but as I think about all the changes required, I'm wondering about hitting my HP goal of 550hp. I know about what it will take to get a LA stroker there, but what about a 5.7 or 6.4 Hemi? If you are going to mod one or the other, which one will be less expensive to hit the mark. The 6.4 doesn't have far to go, but it is a bit more expensive to start with. It will have a 6speed manual behind it and fuel injection, which hits the budget pretty hard too.