.....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.
I saw that kit during my search and every time it popped up the application was listed as:
Torque Converter Balance Weight & Positioning Template Kit
Fits Most 1971-'79 383/440 (with cast crank)
Fits 1971-'92 360
Fits 1971-'76 340 (with cast crank)
There is no mention of the '70 heavy rod steel crank 440. Do you have a copy of the instructions or some other documentation that indicates this kit has this coverage? Appreciate the help.