I've just managed to wreck the head of my 1.5 diesel nova van thanks to the cam pulley bolts coming loose how hard would it be for me to replace the 1.5 for a 1.7td? what would i need? is it a simple drop in and go? would i be able to mate the 1.7 to my current gearbox and engine mounts? or does anyone know where i can get a new/recon/second hand head from?