Personally...if you are buying a whole new head, then I would suggest getting something better than stock that allows better filters. Stanadyne or Racor. The Stanadyne PM-100 fits on the stock mounts with zero modifications.
X2 on a Stanadyne PM 100 filter. I have the 6"/.2 micron filter mentioned above and it fits in the stock location. If it gets cold where you live I suggest getting the optional heating element for it. If it drops below 40 the heater kicks on and warms the fuel before it goes into the engine.
Land Rovers. A loosely associated collection of parts, generally traveling in the same direction.