I just did this swap this summer (from and 86 Cressie). It is the same and since you are just changing motors it will bolt up easily. You should also look into pulling the rear diff off the Cressie, as Cressies' diffs are usually in MUCH better shape than Supra diffs. I wish I had, but found this information too late (that they were usually in MUCH better shape due to the automatic, and different mind set of the owners). Good Luck.
PS I just thought of this, the engine harness from the Cressie will be different so you will need to use the one off of the Supra and you may need to change the Throttle body of the 87 to that of your 85 if the TPS is different - not sure from 85 to 87, it may be the same. The 86 to 84 was different so I just switched the entire TB so it would work with my wire harness. Keep this thread current and if you run into any difficulties I may be of some help. You can PM me if you don't want to post in the open, but any problem you will encounter, someone here has already had and may have an easy solution.... that is why we are here...sort of.