I've recently fitted one of the Webcon manifolds, so I thought I'd share my experience.
I travelled to the UK in September (and had business class luggage allowance for my return
so I decided to take the opportunity to bring back a few bits and pieces for my cars.
I contacted Jerome ahead of time by email and purchased a kit (everything apart from the carb itself as I have one) and picked it up from him when I was in London.
I now have the manifold fitted, with my re-jetted DGV, complete with the plenum/cold air intake and new linkage.
I was previously using the DGV with a log type manifold, both supplied new from SS (prior to that I just had boxes of various original manifolds and stombergs as the car was in bits). I was never happy with how it ran with that setup; terrible flat spot which I couldn't fix by changing jets. Also, the DGV is a tall carby, and I could only fit a small foam air filter on top. I then changed the carby to a 28/36 DCD, which improved things greatly but I still suffered from a flat spot and difficulty hot starting.
The new setup fits and drives very nicely, almost no flat spot, much more responsive than the DCD when just on the first choke, perhaps not the same kick that the DCD gives when the second choke opens, but generally a much smoother delivery. My hot starting problem seems to have eased. The plenum fits well and I fitted a k&n filter in the nose next to the radiator. I think it looks ok, at least it's better than the domed ramflo foam filter that I had before. Throttle linkage is smooth and an improvement on my previous home modified version.
I haven't put too many miles on it yet, but overall I'm very pleased. Yes it was expensive, but it now makes it more likely that I'll drive the Alpine instead on one of my other cars! I've never had twin strommies on the Alpine, but I have lots of experience of them on other cars. Excellent carbs, but they do need a bit of maintenance and tweaking to get right and will probably eventually leak... I was planning to put a pair back on as I have all the parts, but I'm not sure I'll bother now.
Jerome is the nicest person to deal with you could imagine, and a real Alpine enthusiast (he has several, some original some not). It's hard to fathom the odd negative comment that I've read here about difficulty in getting information or supply. He kindly picked me up from his nearest London tube station in his fabulous duratec (or was it zetec?) Alpine (despite inclement weather) and took me back to his place to pick up the kit, and of course have a cup of tea!
He was happy to supply the whole kit or just the bits that I wanted and supplied suitable jets when I described my engine spec.
Overall, very happy.