yes for sure for the price(300€ each carb + the plenum) it's better to have a significant change, and in effect it's better to have all the componant in harmony for the best result you 're wrigt.. i'll just want to now if it's run with a standar engine, because i project to do that little by little. And open the engine is not my first project, but if i had to restor the S.U, i'll prefer to buy 3 weber, than spent time and money in the original carb. thanks for your reply Ben