Nzwrecker

Hi all. Is anyone able to tell me which engines will bolt in to a gf2 cz awd impreza it currently has a small ej15 engine. My intentions are to drop an ej20 single turbo engine along with all running gear harness ecu etc. Have access to a huge selection of parts etc. So cost is not an issue. Nor is time. Just after information on what model engines i would be able to use. Any help will be much appreciated. Will be posting my progress as i go. Cheers