Opinions please- new hemi or 408?

The car is down to the bones right now. I'm also rewiring the entire car and converting the 408 to EFI. I already have the engine controller which will work on the 5.7. The car was already setup for a tremec and I would intend to use that too. I don't give a **** about the name hemi- more interested in the modern motor. I'm just wondering if it's worth the BS to make it fit