As far as I know.. The towers bolt to the frame are all the same. At least what Ive come across, It was just the rubber engine mounts that was what you had to change depending on the engine. As for the radiator, you can use the 460 rad, But what was different was the fan shroud. Meaning, Where the fan opening was,centered, off-centered. But If you get a shroud from a 73-79 I6,It might not be the exact width of the 460 radiator. In these trucks there seems to be different width radiators concerning where the shroud bolts up. That engine with the correct rubber mounts should just drop in. Double check though just in case I have something incorrect. But all these years playing with these trucks,I have not once had to change towers. Good luck