I replaced the pooburg with the Weber about a year back and have not looked back. Trust me you wont be disappointed, its 500% better! The mounting plate is indeed different but my garage got round that
The one thing that I have had to replace since, and probably will be a reoccurring theme is the rubber flange the Carb sits on. If your coupe idles slightly uneven eventually it will split. But GSF normally has it on the shelf for 20 quid.