A Guide to Tuning Weber Carburetors (Borg Warner, 1976) is an Australian Borg Warner guide to adapting Weber DCOE and IDA carbs to engines that didn’t have them. Though old, and only these two carbs, there’s some great basic info that applies to IDFs today. Source unknown, thanks whoever you are!
Weber Factory Tuning Manual was found on the net, appears to be from the 1980’s. Source unknown, thanks whoever you are!
You can download the manuals as PDF files by clicking on the “Download PDF” button.