It has been a long time since I played with any of the S.U. / British Stromberg CD series carbs; but memory tells me lots of folks removed the CD's to replace them with the earlier S.U.'s.
Jon
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop