Hi Keith....welcome to the Forum
I suppose you have two choices, if it is running okay then stick to the Weber carb (they were a great conversion at the time) or put it back to what I seem to remember was the Pierburg fitted as standard...which wasn't a good carb...too many vacuum connections to get it through emissions, autochoke, etc.
Let us know how it all progresses....will bring back memories of carburettor woes :-)
Cheers, Trevor