In other words, every 408 stroker pushing 380-450 hp in a Duster with 3.55 - 4.30 gears would be very happy with part number XXXXX. And that's what they pull off the shelf. Less % than what people think actually get a specific TC that was never built before for their application. If it was built 10x before, then isn't that the same as "off the shelf"... ?? LOL