why do you wanna mate? if youre gonna do an engine swaP you may aswell put a bigger lump in at the same time - if you dont wanna do it yourself look at hillpower for their 1.6 megane conversion. i expect you could just put the 16v head on your 1.4, but would you then need to make it a multi point injection sys? im just guessing but i may be wrong! If you do, surely the hassle involved would be better spent getting some serious power under the hood!