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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
You'll surely get detonation unless you got racing (100+ octane) fuel. The guy had to get the spoul out before adjusting your timing as well. You need a good ignition to handle and allow you to optimize your timing and results. I've seen several 5.0s with 16* timing but they had a full aftermarket ignition and 93 octane fuel. You better check this or you'll ruin your engine with detonation, which is NOT your friend
You souldnt go any higher than 14 if its stock. Are you sure you are at 20 base? Like stanglx said,did you pull the spout when adjusting? If you didnt the spout comes off the dist. wiring and will dead end into a plug harness....pull the plug and then adjust the timing.