I will probably go with the 440 source heads. Im just unsure if they will work with my pistons as the stock 452 are 88cc open chamber heads and the stealths are 80cc..not sure if these will be even more apt to cause ping than what i got now..The pistons are the TRW 2355 six pack pistons with a 2.062 height..I hope they will as i REALLY have been wanting to upgrade heads for a few years!