James is definitely going to need a manual - Haynes or Rover Workshop - and I'd suggest the only bit he really needs to worry about is finding out how to lock the crank and get the cam locked in the right place on the head going on. Also make sure that the head going on has it's own cam set up for its own valves. Otherwise he is sure to need to set valve clearances if he uses the cam from the existing engine on the new head. My instinct from reading James' posts is that valve clearances on a 4 pot might rather test him?
Chris