If you plan on putting your chip back in start at 10* and work backwords. With my ADS chip I had my timing at 8*.
I just adjusted my timing a couple days ago and I already can't remember what direction to turn the distributor to retard or advance the timing. Just move it very carfully and watch the dampner. As long as you move it very carfully you won't damage anything.
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1995 Mustang GT