If you just check it with a light it should fall in a range of 6-15 degrees BTDC at idle in Neutral. This is the normal range depending on engine conditions.
If you have to set it or adjust it you need a computer scan tool to set the engine conditions to a set spec and then adjust the distributor to nominally 10 deg BTDC. This is done with a timing light on the front pulley - of course.
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