Depends on your definition of "easy" is. AE92 GT-S and an older 4 lug Celica GT-S brakes would work. But they are NOT bolt on applications - you will have to do some fabricating to get the rear e-brake to work, brake lines, new suspenstion bits if you cut the hubs off the donor. Also be a good idea to get a new brake proportioning valve and master cylinder to go with it as the one you got wouldn't work properly - safety first.
If you got money to burn - you could go with a Wilwood conversion. They have the proper hubs, lines, etc. Last time I checked - it was like $1200. Not really worth it unless you auto-x. If you want to increase braking performance - better to get better quality pads for the front disc brakes and better quality tires all around.
Good Luck.