First thing to do is make sure your engine is externally balanced by checking if it has the balance weight on the front of the harmonic balancer. If it does according to the Mopar Performance catalogue you will need to buy a neutral balance torque converter and then buy weight kit part # P4120241. This kit is for externally balanced cast cranks as well as the externally balanced 1970 & 1971 440 six pack engines and all other 440's with heavy rods[all have forged cranks]. Kit comes with a template and instructions.