Thought I would share my old Clio experience. If you want over 100 bhp in this engine about 110 and it is very easy as I have done it, no pay attention.
All you need to do is get the head work done, port, polished, so on, reprofiled cams and a port matched Manifolds which I picked up for £300 exchange. Get the Throttle (Carb and injector) form a 1.8 single point Laguna. Remove the 1.4 throttle, bore the hole out a little bit, doesnt need much and put the 1.8 one in. Get a chip of some sort to matched with these mods and your laughing, I paid £600 and had all this done. The car feels so fast, feels actually faster than a standard 16v. It isnt but it feels it because of the torque.
Just thought I would share this info with you lot.