Re: TR3 Fast Road Cam and "RL" SU needles
If you google "teglerizer" you will find an excellent site put together by Paul Tegler, including a comprehensive needle chart.
Spend a couple ofhours there, and plot graphs of some likely candidates and you will be able to make a well informed decision.
If the car is in a mild state of tune,mild cam only or little else,I have found SM needles work well.
Simon.