if its just the sound you are after get a conservative grind from a custom grinder like isky,schneider,crower,engle,et. and have it cut on a 108 or 106 lsa. an isky 270 mega -270 duration(221@50) 465 lift 106 or108 lsa would give you that "sound" your looking for and still have plenty lower end torque so it would not be a dog on the street.