Anybody ever swapped out a heavy( stock) rotating assy for lighter aftermarket?

Wouldn't it just be easier to upgrade the rear end? Just get the lighter rotating assembly balanced but why mess with it at all if your worried about the rear. What transmission are you using?

904
i can upgrade the 360 for good bit cheaper than buying a new Dana. Would probably sell the 418 at that point
I am getting old and been in the 9’s for years and years. Want to not have to work on things anymore.
Light 360 with heads i currently have and the extra compression new slugs( would go flattops zero deck) would easily get the car into the 10’s and sate me
8.75 live a long life that way footbreaking