Hi Arnoud,
Sorry for the delay in replying, but my car is in storage whilst my garage/workshop is being built at my new house.
I can't really help as my manifold is cast with "Warneford Design" on the top surface. It came with the triple Weber DCOE 45 carbs when I got them and I have never seen another Jaguar manifold like it. I understand that Wally Warneford was a one time racer in Australia and hence this is the origins of my manifold, which could well be a period item as he was producing various manifolds from the 1950's.
Sorry I can't be any more help and good luck with your rebuild.
regards,
Dave