So I have a '69 144S with a B20B equipped with petronix electric ignition and weber carb. My vacuum is sealed off. My Haynes guide says that originally the engine should be at 10 degrees BTDC. I am at 14 degrees BTDC. Is this correct or okay to have? Does the electronic ignition or carb change anything? If so, what should I set it to?

WHAT DO?!

Thanks,
/Tusk.
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Make it so it works.

What is most important is total advance.

What is your total advance?

Not a clue. How does one find their total advance?
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Make it so it works.

The answer to your first question is no. The addition of a Pertronix does not
change the timing settings from a conventional points-style ignition.

Regarding total advance...
Use your timing light and an accurate tachometer and watch the timing marks as you increase the rpm.
Start at idle - which it sounds like you already have set at 800 rpm and 14 degrees.
Then increase the engine speed.
You don't have to do this with the adjustment screws, you can work the throttle linkage by hand.
Watch the timing marks as you increase the speed of the engine.
You should see the timing jump from that initial setting of 14 degrees to somewhere around 25 or so at 1500 rpm.
Then increasing the speed more, lets say to around 2500 rpm, should change the timing from 25 to 35 (or so) degrees before tdc.
Increasing the engine speed from 2500 rpm shouldn't change the timing.

So I think what planetman is asking, is what is the difference between the initial setting and the maximum.
My numbers may be off slightly, but that's the gist of it.

I happen to set my timing to 22 degrees at 1500 rpm instead of at the initial
idle setting.
It is how Volvo recommended it on the B18s and has worked for me on B20s as well.

Curious what carbs you have.
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"Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig

Thanks! This should help a bit.
I don't have the dual SU's, rather a single Weber Carb with dual bowl chambers.
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Make it so it works.