SU Carburettor Needle Size

[Paul Lawrence]

I am asking this question about SU carburettor needles on behalf of someone who doesn't have access to the internet.

They have a Speedex which has twin 1 1/8 carburettors with no springs, larger inlet valves and a Fast Road High Lift Camshaft.

Is anyone running a similar set up and if so what carburettor needle have you found works best for you?

Thanks,

Paul