Sell them both and run 3.91 gear. The 440 has more then enough low end grunt (even with the tunnel ram) to move you down the track. If you go to low on the gear selection you will over power the tire. I have run 4.30 , 4.10 and then 3.91 and it went faster with lower ET with each change. This is with 28" tire A body. Why spin a motor higher then you have to to get the same results. ....Phill