my old girl has got forged pistons but the standerd 225bhp kits run on totaly standerd internals, the old cast v6's are strong old lumps. im not shure of the torque limmit of the box's i know of one bored out to a 3.7 and supercharged with 373ft/lb's and the mt75 takes that. the old 2.8's used the type9 though and thay dont like more than 200bhp