5.0 litre for the sound!
I'm not 100% on this, but I think you can get a 304 to sound tougher than a 308. So I voted EFI. 5.0.
At the end of the day though, I like any v8. I work at maccas and served a guy thru drive thru the other day in a black VZ SS ute, he had a loud exhast, sounded awesome. He was giving it revs and kinda ripping it up all the way through drive through.