The Rover V8 was supplied from factory with two different twin carb (carburettor) setups and several EFi (fuel injection) setups. There are also common aftermarket carb kits and what is becoming more common EFi kits as well. THe aftermarket setups can very from slightly with carb setups to vastly with EFi.
The below descriptions (and soon photos) will help you identify what fuel system you have fitted and clicking the relevant link will go into further information and even checks for diagnostics.