Building a 10.5 cr 440, closed chamber aluminum heads and setup for quench. Planning on running on the pump 94 octane I can buy 5 minutes away from my house at the local gas station. However I am also setting the car up to be able to take some longer road trips with - overdrive trans, a/c, cruise. I'm concerned because it's quite likely I will end up needing fuel and be in a small town that only has 87 available, 91 if I'm very lucky.

What do you do? I would bring along some race fuel to mix but I run an o2 sensor and I hear lead's no good for them. And 100 octane unleaded race fuel won't get me that far with mixing. If not that, then bring along the timing light and back the timing down 10* or so and go easy on the throttle while you burn the 87?