The 2031 makes a good blower cam due to the slpit valve lift and duration it will good NA though. Most NA cams feature a lot of overlap, the 2031 intake valve closes at -1 and the exhaust valve opens at 6 I think. The only problem some people have is idle issues, my dads 93 Cobra had a real hard time finding a idle now it's not a issue because he runs a SpeedBrain, but I run a much more radical cam and my stock 91 computer takes it pretty well?
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98