This is a very old thread and also my first time one this forum (Hi everyone!) - but I thought I might still get in touch with someone who knows this.

I am about to go through the same Weber (K248 kit) conversion on my W116 280S after I finally caved in (my Solex is badly bent from previous owner bolting it on with too much torque and a complete rebuild didn't help either).

My question is:
There is a thick insulator with glued-on gaskets on the intake manifold onto which the carburetor mounts (this one here). Is that still required with the weber kit? Or does the kit's adapter plate bolt directly onto the intake manifold?

Thanks!
Agav