My first truck was one of those back in 76-77-78 and I used it to deliver news papers to about 15 kids routes and then a 160 paper in downtown seattle. Had a lot of fun with that torque monster.
I rebuilt a 292 for it and got a set of tri-y headers for it. Two headers and all I could afford to finish the exhaust was a couple slightly used turbo mufflers and a 2" set of pipes I made from an old swing set. Young and broke equals the mother of invention. That engine would pull as much as I wanted and actually got decent mileage but gas was cheap then so big whoop.
When you do get to the top of Pike's Peak, be sure you force yourself to keep breathing deeply. Shortness of breath will creep up on you so keep deep breathing. You will not hyper ventilate. Also somewhere near there is a really neat fossil site which is one of the few in the world that is from the age of insects. There are also some really cool old towns in the area. Try to make it down to Canon City and take a drive along skyline drive. A super max prison is also there. Lastly, try to go for a ride on the Royal Gorge Scenic Railroad there too. Such a neat area to visit and no shortage of stuff to do.