If you have 3.90s, then you should be going through the traps in 4th gear well before your limiter on a 26" tall tire. Last time I was out at the track, I went through the traps at 112 mph in 4th with a 26" tall tire without banging the limiter.
You've got about 100 more rwhp than do I though - you may find that the extra sidewall on the 60 series tire will help you with your 60 foot - that may be worth the tradeoff for the larger diamater. I really can't say.
On a stock 4x4 suspension setup, I don't believe it will, but I would get the bat out and roll those fenders just to be safe. I've seen some slicks on 15" rims and no suspension mods but control arms, and that didn't rub at all.