Base Timing Questions

VA is being confused with VS.
VA means vacuum advance & it is that pod on the side of the dist. So ign related.
VS refers to carburetion. Some Holley carbs [ & clones ] open the secondary throttle blades by using engine vacuum.
An engine with 12:1 comp ratio will need less idle & WOT timing than a 9:1 CR engine, all else being equal.