16v heads aren't the be all and end all of engines.
Some 8v'ers are way easier to modify than 16vers, and so on the whole you see more mod'd 8vers.
anyway, a transplant would be seriously easier than turbocharging (you really need a mapable ecu etc, and some other mods to make it worth while).
Van Arken make bolt on turbo kits, they used to make em for 1.1 cinq's I belive. You basically buy the whole kit, send your ecu in on trade for one thats been remapped and fit it all together in your own garage! Cost a bit though, but usually less than a custom one, obviously not going to be as powerful but hey.
Damn good engine transplant for you would be the bravo HGT plant, can be had inc gearbox (you need it, as well as its integrated diff and driveshafts, suspension arms, shockers, disc brakes and calipers, and uprights, whole lot can be had from a scrappy for maximum £500, thats a damn site less than £3 for a turbo that might get you to 110bhp?, HGT is 155bhp, and its name won't push your insurance sky high,**
**insurance co's are thick, i.e. citroen ax GT, and Forte are the same car, just one has GT alloys and three GT badges, both kick 74bhp from the same engine and suspension interior etc, GT is group 14-15, Forte is Group 4-5.
