Hi..
As far as im aware, you wouldn`t be able to put a 16v head on your particular model, as its only a singlepoint injection. You may be able to do it on a 2.0i engine, the B20f as it`s a multipoint injection. It wouldn`t be as simple as that though, as you would have to change all the engine management system too. I did read somewhere a long while ago however on another forum, that a lad took a 1.7i engine from a phase 1 440, fitted it and put a R19 16v head on it, chipped it and put it in a Clio for racing! What a waste! So im sure if he can do all that, you could do something too.
You can visit
www.volvotuning.co.uk - im not sure if they cater for the 440, but they may. Also
www.kalmar-union.com , they may be able to help too. Im sure if none of these stock anything for the 440, you could always ask if they know somewhere. Also, try
www.needforspeed.co.uk - based in Scotland-they have a car specific section and it will list everything they do for your particular model.
Hope thats been some help!
Dan.