A couple of weeks ago, I emailed Holley Aust. (In case everyone doesn't know, Holley have owned Weber for years.) All I wanted was a sketch of the layout of the bolt holes on the mounting flange of a 45DCOE.
They came back after a couple of days asking me to consider one of their manifolds.
I went back explaining that the manifold I was making was for a race car and that theirs would not suit.
The silence from then has been deafening.

Weber make a great carby, pity about the crap back up service.