I don't know of any full suspension kits for the Cressida, but there are plenty of options for lowering involving a spring and shock drop. I know certain TRD Japan blue 8k/10k springs will fit that car, as well as some springs for 3rd gen. Celica's. There is also Ground Control, I am fairly sure that they make a spring and sleeve setup for the 83-85 Cressida. (though the Eibach springs that come on those are a little soft for my taste) I will research it a bit and try and post again asap. Great buy though, I have always been partial to the 83 model. Should be a fun car to build up!
I hear Supra mk2 stock springs will bring me down 2.5 inches. I dont know if thats true or not. If they do, I will just throw those on there with some stiffer shocks.