The standard (Zenith carb) Series 3 choke cable is slightly too short to use with the Weber. So you end up using the Weber choke cable and locating it somewhere on the dash or the bulkhead. I don't think the Weber cable will fit the steering lock. I've been meaning to make up a longer version of the Zenith cable (with the switch for the cold start light), but it's one of those jobs that never seems to happen.
Let us know how you get on...