Remember that depending on the stop bushing used --- when you advance your initial -- you're automatically advancing your total (you add the stop bushing spec to the initial timing setting). Thus the recommendation to switch to the 18* (Black) stop bushing.
With the light silver and light blue springs all your timing should be in by around 2000 rpms... so that doesn't allow you much experimentation before you have way too much timing using your current 25* bushing.
My 408 SBC with EFI runs 15* Initial and 33* total. Small Dart 180 aluminum heads, smallish cam and dyno'd to come up with that combo.
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