I had dual webers on my first Porsche 914. Dellortos (very similar) on my second 914..
from the day I owned them.... I wished they had the OEM systems - LOL
I think its just better to start from scratch (all original)... before I get into "modding" a car that quite frankly, has about as much horsepower as some of my 3 y/o son's toys LOL