Have fitted the K&N filters to both the carb and engine breather. On mine the larger main jet doesnt appear to be needed as there is no hesitation in in accleration or whilst on constant throttle settings however I will keep an eye out in case it develops. No nasty smells from the crakcase breather but the engine doesnt breath heavily anyway. A small but noticeable increase in performance which is a nice bonus. Over 150 miles so far with new setup. New shiny rocker cover fitted so underbonnet smarten up begun.(thank you ebay). EBC green stuff disc pad have made a marked improvement on pedal feel and braking. Thanks for all the advice, to someone new to Morgans, great chat room.