http://www.prestage.com/carmath/NHRA...on_Factors.asp
you only need the cage if you run 10.99 at your track...
the MPH should be the same on every run... gears wont change the MPH you run... they will change the rpm yopu cross the finish line at.. look at what the finish line RPM is and get gears that have you maxed out in 4th gear.. ;-)
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84 convt,'95 302,AFR's, performer
3.55's, underdrives BBK shorties
stock cam, 1.7's
13.85@102.5
and a '68 stang that WAS nasty ;-)