I wouldn't worry so much about the cam lope though it sounds nice in a hot rod.
They usually don't preform well in the mud where you need that grunt power.
I would quite worrying about rpm's so much and focuse on torque.
You start turning 7,000rmp's and then hook up with those big tires, I don't care what you got under it, your gonna be making some trips to the parts store for some new stuff.
I used to go mudding all the time and help plenty of my friends out with thier stuff.
I would see these guys in giant trucks go out in the mud spinning their tires at big rpms
and get stuck every time. Then this little Isuzu would creep out with some tow straps
and pull these giant trucks out at no more then 3000rpm's. We would all sit there and laugh because these big trucks would be sunk to the tops of their fender with 44's under them. Here is the kicker the Isuzu was running a Toyota R22 4 cylinder motor.
Pulled them trucks out every time, never once seen him get stuck pulling those other guys out in years. Kurt