You'll need MK2 digifant injector inserts, these screw into the head with an allen key. I'm not sure what size they are though! (this is assuming you plan to use MK2 digi-shaped injectors though.
You'll also need a compatible fuel rail & FPR too, and you'll probably want a MK2 digi throttle body so you get the idle & WOT switches. Then you need to think about the airflow sensors you're going to need, and how you're going to attach them to your throttle body...
Oh and the ignition system will require some thought, I recon you'll need a MK2 digi dizzy with a hall sender in it, along with the plug that goes into it.