WOW!
Thanks to everyone for all the encouragement! It's good to hear your stories and It's good to know that it's not an unreasonable thing to try.
Fried Green T'mater & Lugnut123: Thanks for the offers of help, I'll get back to you as the time gets closer and the plans firm up.
Cletis: Yes, I am familiar with carbureted engines and the effect that altitude has one them, that was one of my big concerns but is sounds like if I take it slow (and I probably don't have much of a choice about that

) I should be OK. BTW the altitude has the same effect on people, moved here from sea level and it took a year to not wheeze running up stairs.
GMONIZ: Thanks for the link, another inspiring story and great pictures! Yes, I plan to carry a GPS, probably two. The AAA card is a good idea but I may just have Dad follow w/ his trailer as a support vehicle, we'll see.
JiMerit: Great idea but I don't know that I'll get a chance for any test runs. Dad drives it once or twice a month and the day after Thanksgiving my Son & Daughter & washed it up, gassed it up, & aired up the tires and drove it to the In-n-Out Burger in Washington/St. George for lunch w/ my Wife, who had been shopping w/ her Mom, and then over the he in-laws and gave each of them a ride and then back to Hurricane. Total distance about 45 or 50 miles and it ran great! No leaks that I could see but I plan on carrying extra fluids of all kinds just in case. I do plan on doing a tune-up, oil change, and adjusting the breaks before I start. Thanks for suggesting a spare coil, I was thinking belts, hoses, plugs, & fuel pump but not a coil and the 40 is all 6 volt so finding a 6 volt one in Mexican Hat, UT could be a problem.
Anyone else have any suggestions on what spares to carry?
Grigg: Yes, It would be best if this could be an open ended trip but I will be lucky to get the time off for the trip at all. Four day's driving back plus a day to get there and a day to prep the truck that's six days, even over a weekend it will be a push. And I know I probably shouldn't over plan it but I'm an engineer, what can I say, I've already done an Excel spreadsheet w/ the times, distances, expected lay over times, speed, anticipated fuel usage etc., obviously I've been an engineer for too long

Wally: Thanks for the shot from Goulding's, Beautiful!
To all who said take pictures I will and after reading the blog that GMONIZ linked to I might blog or tweet or facebook the trip as we go.
Thanks again to all I'll post again as the plans develop.
Bob