It depends on how original you want the car to look!
I like SU carbs, (basically they are a bucket with a hole) and with the variable jet can be made to perform how you want them too, I normally find the economical too!
Now I have a solex 32DIS on the 956 and a solex 32EISA in the 845... but I had a look on ebay and those carb look quite expensive, so I think I will keep mines!