Run race gas only if you bump the compression up. You will gain a lot of usable pwr with compression. I think that's what was trying to be said.
As far as gearing, you will have more pwr to pull that 14 with the 22" tires. I think you'll like it. It's like a 15 with 20" tires. It just pulls and pulls. Id start with the 14 and if you think you need to go down do it after you try it.