might sound a good sleeper but there is more work than you think with it...
Why not get a volvo engine, 1.8 turbo, and tune it. They fit in with a bit of welding, and that would be hell of a sleeper! no matter what engine u put in a clio if its 200+ turbo, its goig to beet a lot of cars in the right hands.
I personally wouldnt touch putting an evo engine in, ure going to rip it to pieces. Do something sensible, and easier and you will get far better results.
consider putting a 306 gti6 ingine in with a super charger conversion capable of 350bhp to 400bhp (and this is prooven)