Done plenty of times, saying is it worth it depends on your own preferences, bear in mind you would be fitting a much older design of engine,carb fed, and you would most likely want it rebuilt - but it would get you 170odd bhp quite easily, personally iv found a f7p is lovely with a decent filter, exhaust manifold, decat, exhaust,cams and a map - or even cheaper than both would be dropping a 2.0 in, either a williams lump or megane lump- with breathing mods is a very quick car