If you look at the intake opening and closing points, and the exhaust closing point, they will be the same as a cam with
283 int 283 ex, and an lsa of 112.25. A cam with more exhaust duration needs a wider lsa to keep the same number of overlap degrees. With 11 degrees more exhaust duration, you have to widen the lsa by one fourth the difference in intake and exhaust duration to keep the same overlap degrees.
So i look at cams as being straight up if i do that math and set them with the new number. I am not sure where i would run the cam in your motor, but i have a 285 / 296 /114 lsa cam and i run it at 110 installed.
That would be 1.25 degrees advanced IMHO.
The exhaust opening point is earlier on a cam with more exhaust duration because high compression motors can tolerate it. Much more of the power production is already done sooner when you have 15 to 1 compression.