In my experience of other NA stuff, cams definately improve things, often at the expense of lower down in the rev range, and a remap to make the most of the cams clearly makes sense.
I am cynical of the benefits of changing the exhaust though, from what I can gather the mani is already a very good design, the cats aren't especially restrictive, and as for the cat back system, there are seldom any significant gains to be achieved, just more noise, and typically extra longevity from a s/s system.
Granted, I have not tried these mods on a 197, but based on the Puma the only real way to improve things is remove the restrictive mani & close coupled cat (which is already done on the Clio), cams, remap, and an improved inlet manifold and plenum. The inlet design on the Clio is interesting, however I would suggest that positioning the plenum directly over the head isn't a great idea as heat soak becomes a problem. If you look at the Cosworth and Ford Racing inlets for the Fiesta ST and Racing Puma respectively both have a significant plenum at the front of the engine, which keeps it much cooler.
