ok so im getting a 12 valve grail truck. its going to need a clutch soon. it has a lift and 35 inch tires and free mods. my question is how much horsepower do i have with the basic mods (keeping stock turbo and injectors) though the truck comes with a bigger tst exhaust housing? second i know sbc is the best but ive heard some good about valair too, are they good for the power i have?