I have both an Uno powered X and a dual carb Race X. While the dual carbs offer alot of raw hp, they are a pain to adjust and keep adjusted. With the Uno (uno bits added to a 1500 that is) at 7psi boost, the pull was amazing. Interestingly enough, the stock ign unit of the 1500 FI works fine with the uno set up.
Since the bee is stripped and awaiting a repaint, the real Uno block will go into this, along with the twin intercoolers from a modern Abarth. With all that cooling, I'll probably upgrade to a TD04 turbo.
Just food for thought. Good luck, you should be happy with either option!