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Old 09-03-2008, 10:18 PM
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Go with manifold vacuum
Here's a quote from a posting on this forum:

For peak engine performance, driveability, idle cooling and efficiency in a street-driven car, you need vacuum advance, connected to full manifold vacuum. Absolutely. Positively.

Read the full post "Timing and Vacuum Advance 101" here:

Distributor Tuning and Theory - Part 1

I was pondering this same question myself the other day and was searching the subject...
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