You're presumably on a Pierburg at the moment and you're looking to swap out to a Weber, yes?
Basically disconnect all the crap hanging off the Pierburg, block the coolant hoses that went into the Pierburg, throw the Pierburg away and bolt up the nice, cute far more effective little Weber, on the correct adapter plate.
Get in the car and below the steering wheel, to the left there is a blank that you need to remove - there's a single fixing on the back of it to unscrew and it just pulls out of the dashboard. Now pierce the grommet in the hole in the firewall ahead of this location and poke the choke cable through the hole. Connect this up and away you go.