Rootes1725cc

A while ago I bought a pair of Stromberg Carbs previously used on a Triumph GT6, the carbs work ok but are running rich. Does anyone out there know what needles I should fit to get the correct mixture.
Cheers,
Neil.

Alpine Workshop Manual spec. is :- 5M needle, spring uncoloured.
See http://www.rootes1725cc.info/wsm145/WSM_1/1.htm Page19.