My old 68 Ferrari had dual distributors. In order to time it you checked and adjusted each side independently as if working on two I6 engines side by side. No problem. No need to disable the opposite bank of cylinders at all.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.