66 suburban, LS install and suspension drop.

[v30crewcab]

I have a 66 suburban in the shop right now. swapping the front suspension out to disc brake/5lug, and we plan on doing drop spindles front and rear springs to it, and installing an 02ish 5.3/4l60 in it. Anyone done an ls swap in this body and have any pointers? we have a complete late model suburban for the donor that runs and drives.
I'm not new to this, but haven't done the LS part yet, so not sure what else besides motor mount brackets, and rear trans crossmember that might be needed.