deffo go with Nelly's advice about fitting to the original carbs.
  be careful with the bowl seals and diaphragms in case they stick to the carb body. 
 there might be a fuel filter in the inlet pipework that could be worth a clean. 
 there probably will be some nice gunge / water in the float bowls !!! 
 PDQ sell the proper cleaner K+N air filters 
 erm...finally - try and take some digi pics before and during work.......I found it quite helpful especially when routing the PIGGIN throttle cables once more 
  Good luck