Here is a link to software that will show 1/4 mile ET and times with speed for each gear and all the items are variable. Meaning you can repeat this run with 28 or 28.5 tire and a 3.55 or a 3.73 ratio rear or a different 1st gear ratio = etc... They charge 5 bucks for 30 days of use and as many times in that 30 days as you can input so DO YOUR homework as heard so many times. I use this all the time and find it is reasonably accurate with real world outcomes. Know you do not want to drag car but this is great info for dialing in .
http://www.smokemup.com/auto_math/edragstrip.php