It's been a while, but alky if you can get consistant fuel easily is a better route.

The plugs are harder to read, 02s can fool you until you get a good baseline, but it's much more forgiving and the sweet spot is wider, making it better for all day events where you run at 10AM, 4PM and 9PM.
You will want that weather station to include water grains too. It's more affected by this than gas is.

I don't know about east coast weather, but out here if you want to run a 10.00 index, you want you be able to run a 9.8 or faster in the worst expected conditions (hot, muggy, low baro) and drop what it takes to run the number no matter what. Given you have a car, you should be able to plug in the numbers and come up with a target HP/torque/RPM and build with those expectations.
There are plenty of BB combos that can do the job, you have to decide what amount of money, maintenance and longevity you are willing to suffer.