Just as an example of one of many, Dave College of Retroford uses Emerald on tb's, to get 280bhp from a 2 litre, in his escort estate, there has just been some very interesting back to back testing done on different size tb's on duratecs, but I have not been to see what the outcome was, but jesus are they noisy!!
There were three cars there(lotus 7 type ones) the first running perfect on weber alpha fully mapped, but after some hours he changed to emerald although that was more to do with accessability.
tabetha