The CT20 is plagued by heat issues which in turn leads to cracking. It is also not very efficient in producing boost.
With some fab work, a CT26 from a Supra 7M-GTE can be adapted.
With some fab work, or as stated above, a T3/4 can be adapted as well.
This gets the turbo physically bolted up to the engine, tuning the engine to make it all work is where the hard work begins.
The stock fuel system and engine management system on a 22RTE is only good to about 7-8 PSI of boost. After that, it will cut out.
A stand alone engine management system, larger injectors, and pump, as well as a myriad of other things are required to actually get it all to work right.
There is a huge list of old posts on the Yahoogroups 22RTE e mail list. Check em out. There is a ton of knowlege there