how does this combo sound?

well it depends where you have the vtak set at, and how big of a obx muffler you have, id go with a 7incher, it should make about 800hp, Then add that NAAAWWWZZZ!!

Haha not!! id think around the 400 range as well, id deff go with the fuel injection myself, but its your engine and car, so its up to you!!