UKPassats

Hi guys, im considering doing a s4 2.7 bi turbo engine conversion to my 98 b5 turbo, has any 1 done 1 on here? would like as much info as possible, Do b5's have room for the prop and rear diff to make it 4wd? Are they a direct bolt in? etc etc ive seen it been done before but it was done to a 4wd sy...