like i said before i dont know shit about a turbo car.but i have seen a t67 make power on a 331.347.351 and if i put it on and the shit dont make power ill buy a bigger turbo.i just dont care to make over 600 because thats when my shit will start to break.i dont want to push it to the max like i did my 347.i only got the 351 really because it can handle more power then the 302