David Vizard theory is people generally run too much duration so cam companies run a wider Lsa to compensate, so basically you figure out needed lsa with 128 - (cid/8/valve size x .91) and the overlap you require and the duration sorts itself out, the formula is for I think a 10.5:1 cr probably need to go around 1 degree tighter lsa for 8.5:1 cr I forget exactly.
A 1.88 360 = 106 maybe 105 with 8.5 cr, if you ran the overlap of the xe268h you need probably 5-10 less duration so something like 115/120 on 105 lsa.
Bigger valves like 2.02 would be wider like a 107 lsa and maybe 118/124
you have to calculate I'm guesstimating.
