Track / dyno is a good place to see where you're making power.
Keep in mind that the stock cam is not meant for high rpm power, rather more low-mid end torque. 5200-5300 is a good starting point.
Good luck,
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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