Nah, 4:10s is plenty with my 35's. About 2500 rpm at 65, I wouldn't want it higher than that, I drive on the freeway a lot. Right now its about 2150 or so with the 3:42s, which is actually nice if freeway was all I did. lol.
The 14 bolt has 4:10s anyway, part of the attraction is only having to regear 1 axle.
And as for the front, like I said, there is no way this is happening before BB. So, I either go open front and rear, or put it in the front. I'm certainly not going with 4:10 in the front and 3:42 in the rear.