Sounds more and more like it’d probably be better just to go with a t-56 magnum instead of the tr6060, unless I’d wait to swap the tr6060 until I do a G3 swap, then it’d Nville be a bolt in deal.
If you don't plan to keep the LA, seems like a bunch of work for a temporary solution. If you plan to do a G3 swap with a TR6060, I would do them both at the same time.
That said, a T56 Magnum could be swapped now with the LA and the only part that would have to change later would be the flywheel if you did a G3 swap. That seems much more reasonable.
I guess converting the front to an LS based TR6060 would work as well. Still more work than just swapping a Mopar TR6060 in with the G3 though.