Yes I understand what advancing and retarding do the cam do but experimenting on dyno cost money and experimenting in the car takes lots of time, if I can get in the neighborhood based on what others have found could really help.
If I understand correctly the "9108" can has an intake CL of 108 degrees an exhaust CL of 112 degrees and a lobe separation of 110, so it is ground 2 degrees advanced. So Lee you advanced your cam 1 extra degree. Did you do that because you found you needed it from your experience with your car? Do you race pure stock with stock manifolds? What compression are you using? Does the compression you are using work well with such a large cam? Lots of questions, sorry.
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