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what would the difference between ramping the timing starting at the top @800 rpm and running the line toward the bottom @ 3000rpm vs. starting at the bottom @ 800 rpm and running a line towards the top @ 3000 rpm
By base timing he means the maximum timing possible with no timing retard working.
Once you have that set you can ramp up or down anyway you want but never over the max.
 

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what would the difference between ramping the timing starting at the top @800 rpm and running the line toward the bottom @ 3000rpm vs. starting at the bottom @ 800 rpm and running a line towards the top @ 3000 rpm
Remember; the ignition can only retard timing back from your base setting on the pickup.

So,
With the line flat, at 0 degrees, (top of the page), the timing will be whatever is set on the pickup.

Ramping from 0 degrees (top) down towards the bottom, will pull more timing from the engine as RPM increases.

Ramping from somewhere down the bottom (say 10 degrees) back up towards the top (0) will put more timing in the engine as RPM increases, but only up to whatever is set on the pickup. You can't go past that value.
Think of this way as like a mechanical advance curve in the distributor.
 

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no you would lock the dist at 35 . put the dot at 10 and it pulls it back to 25 at 800 . put dot at 0 @ 3000 at it will go back to 35 @ 3000 .

it will only pull timing .
 

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no you would lock the dist at 35 . put the dot at 10 and it pulls it back to 25 at 800 . put dot at 0 @ 3000 at it will go back to 35 @ 3000 .

it will only pull timing .
^^^ Exactly
(Assuming the distributor is 'locked' and doesn't have a mechanical advance curve in it).
 
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