Ported -vs- Manifold - Vacuum Advance Scenario
I was wondering if there is any difference (or preference) in running vacuum advance through manifold or ported in the two ways below. The various items I've read on manifold -vs- ported aren't perfectly clear to me, I have a 383 (vortec heads, 9.7:1, 268xe cam, 2000 stall OD) which likes more initial so I have a vested interest. Perhaps it's related to my advance can, but the manifold seems to fluctuate the advance* for me.
A) Running 10* initial w/ ~10* from manifold vac advance, and using 'full' mechanical adv. or
B) Running 20* initial w/ 0* from ported, and limiting the to mechanical advance.