91 octane should not be a problem here in CO. One trick, find gas stations near lakes or reservoirs. Boat folks like higher octane, it seems.
But I seriously don't think you'll have any problems. You can always tweak timing in 2 mins if you get pre-combustion happening. A cool thermostat might help with that when climbing hills.
As for the Webers... yeah, you ain't gonna want to re-jet those just for a quick jaunt over the hills. I bought DCOE40s for my car off ebay.. they came from California, LA area, so presumably were jetted for that area. I bolted them on and ain't touched 'em since. It runs fine at 5000-9000 feet. Runs great, actually. And I'm pretty sure I'm running a good bit more 10.5 comp.
Avoid cheapo gas stations, go with the brand names. Conoco, Phillips 66, etc. in this area. 91 octane should be easy to find. For some reason, the usual here is 85, 87, or 91.
Basically, don't worry about it. If you anticipate a leg in your journey that takes you from high altitude to low in a day, make sure your tank is low when you arrive at a location that offers higher octane.
Do you know what your CO route is? We (I speak for myself and other good folks I've met) are here for you in this area if a problem comes up...
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-Matt I ♥ my ♂
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