Colbycan

Hello fellow Audi enthusiasts about 7 months ago I became the proud owner of a 1994 cs 90 quattro absolutely fell in love with the car. Everything about this car fits the needs of my life. Unfortunately the engine is done but the car is in fairly good shape not to mention new lights and bumper and lots of other little things I have got for her.

My question is where do I start looking for a 2.2l 5cyl out of an s2 or rs2? Or is it very unlikely I'll find one?
I want a engine that will give her more kick is there another that will give me all the pleasures I desire without too much modification? Please help I don't want my baby to die had such a bad year since another car if mine was stolen really would like to save the audi!!!