Coming to this party a little late, but...
No mention of the improved performance the Weber conversion provides.
The only draw back is the racket the intake sound makes.
It's LOUD!!
I installed a Weber on my 79 D50, the Mikuni/Solex was so miserable, it was almost not driveable when cold.
It now flies (much quicker) by comparison to the other carb, and when cold, pump gas twice and the engine idles. No stalling.
In another life, I installed these kits on so many vehicles, I don't remember how many.
Everyone who I did the conversion for was almost shocked at the overall improvement.
Post pix if you did the conversion. If you know the difference between a pair of pliers and vicegrips, you can do the swap easily.