You make them up: all you need are the two durations and the LSA
With a 108 cam
First you figure the overlap, thus
Duration intake plus duration exhaust, totaled and divided by two, from that subtract double the LSA; So (292+292)/2 less (2X108) =76*
Next you allocate half of that to each each duration, so 76/2=38.
And there you have your first spec; Intake opens at 38 BTDC
Next bear in mind that all the events have to occur in 2 engine revolutions so 720*.
And the events are intake,compression,power and exhaust,and scavenging
So then we subtract those 38* from the 292 and whatever is left has to add up to 360. So 360less (292-38)=106* for compression. That is 106 from top dead center so 180less 106=74* after bottom. So there is your second spec; intake closes at 74 ABDC.
Since this is a single pattern cam, the other side is identical. This would be an install of straight up, or 108*
Nobody runs this cam straight up.
In a small block on the street, Rusty recommends an install of 100*. In a 440 with enough compression, 104 might be the place to be. This means all the events have to be advanced to:108 less 105=4 degrees
And that makes the events 42,70,78,and 34
Ok I'll fill in the blanks
Intake opens at 42 before top, closes at 70 after bottom
Exhaust opens at 78 before bottom,closes at 34 after top
From this; you can see the overlap events are offset 4 degrees as well ,but the split is now 42 to the intake versus 34 to the exhaust.
While you are in the desktop, try this one; the 284/292/108 in straight up. The events are 36-68-76-36
Intake opens 36 before top closes 68 after bottom
Exhaust opens 76 before bottom, closed 36 after top