Why dont you just get a supercharger made for a celica?
Mine is still NA so im not an authority on forced induction but i would think that if your pulling a GM anything it probably wont work under a japanese Hood
. I know a limited amount about turbos or superchargers aside from what ive gathered on my xterra which is supercharged. From what ive seen though unless you get an intensly generic kit which i have found to never be a good idea, its not happening.
In general though I think to gain any REAL power gain you will have to do quite a bit of prep work re building everything to withstand the higher pressures. You need a new tune for your fuel air mixtures and may need new injectors to keep up with it if you have a big set up.
I guess it really depends on your final build goals, do you want a track car, or something you can deal with as a daily driver?
Again i have limited knowledge of proper forced induction set ups so if anyone else has more ideas or info to kick in it would help.