Well dont knwo if this helps but i dont think that you need a 4:11 It also depends on the size (tall) your tire is. here is a link to play with.
http://5speedtransmissions.com/calculators.html
http://5speedtransmissions.com/gear_calculator.html
http://5speedtransmissions.com/startlineratio.html
http://5speedtransmissions.com/distancecalc.html
With the last one you can even see how far you will go 30 feet or not.
And i have never heard anything bad about this place. So you can get one here if you want