!!!!!CALLING CAM EXPERTS!!!!!

As i recall, Vizards idea of what to is more important;
1st overlap degrees
2nd intake closing
3rd exhaust opening (will determine if cam is single pattern or dual.)
If the engine combo needs 60 degrees overlap, and intake close is 70 degrees btdc then the LSA is 110 and duration of both intake and exhaust are established at 280 degrees. Need an earlier exhaust opening of (edit) 4 degrees? 60 degrees overlap dictates an LSA of 112 to keep the other three valve events where they are.
So if you want a single pattern cam, all you need to know is two things. First, degrees of overlap. Second, intake closing point. The duration is picked for you by just those two events.