Dwell angle 6 lobe distributer

Is there somebody that can tell me what the correct dwell angle is for contact breakers from a Ferrari 400. It has a double 6lobe marelli distributer with single contact breaker per distributer. I can only find the corresponding gap between the points in my owners manual but i prefer to attach my dwell meter instead.
I only have the owners manual, if this is described in the workshop manual and it is downloadable somewhere than a link would be highly appreciated.