It may not be the cheapest, but if you purchase a custom burnt chip (i.e. JMS Chip) you can have them set the rev limiter to whatever you desire.
Just as a side note, if you're in stock or near stock trim, you really don't need to go much higher than the stock limiter. Stock 5.0's HP&TQ drop off quicker than you think. Even my heads/cam/intake combo made peak power at only 5300 rpm and peak TQ at 4500. Just food for thought.
Take care,
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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