Hi!
I did the opposite...I had a carbed engine and an 33 IMOLA ie body. I went for the injection and got out the webers

(God, I miss those webers

).
This was not so easy in my case as I had to swap the back of the engine where the distributor and oil pump is with the one from the ie engine that uses a double coil, a sensor and indentation on the flywheel to get the Spark.
this is only in the Imola Version.
Hope it helps...
Best,
Alfa33boxer