1) Get the exhaust issue fixed.
2) Now, listen for any detonation. If you have any, back down the timing. FWIW, when I was near stock, I ran 14 degrees with 93/94 octane without any detonation. With my TFS TW's, I run 16-17 degrees with 94 and still no detonation.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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