I've never seen one in an AE86, but I know someone who fitted one to a Datto 1600. From what I recall the FJ is a rear sump motor, he reversed the direction of the crossmember and had a custom sump made.

You can make anything fit anything if you have the time and dollars, you just need to work out if you want to do the conversion yourself and deal with the headaches, or just wave around a cheque book.