Has anyone on here had any positive experiences with these - I know there are many butchered/ bored out venturi's out there that have been made by tuners, however I am talking about the kits you can buy from France with 26,27 or 28mm venture, replacement brass venturi and additional parts (and drilling to the carb). I saw a thread on here about a possible group buy a few years ago, but no feedback as to whether these were successful or not. Or am I just better off with a standard carb set-up properly? I have bought a second carb for the engine build, and last night ordered the rebuild kit from the club shop, but would like some feedback, either way I'm not fussed - if you guys reckon its not worth the Group A kit I won't bother and will save my pennies!