If they're the same height as the hemi 6 you've got it made in that regard. Mo hemi 6s here in Wisconsin that I can compare to for ya.
The transmission (around here, anyway) is the Borg Warner AW4 and/or versions of the Chrysler A904/A500 depending on year and t-case... no idea about the Toyota/Lexus setup you're referring to, could be Oz only or such, can't help you there.
Lots of threads on here about the crossmember mods needed for the Chrysler-based overdrive trannies- if using something else, you're back to your tape measure and a best guess! Good luck!
