@Tomster, I'm in a similar boat as you and looking for a Mach 1 as well. The best I've seen for a build similar to yours is from 53k-55k for a 2022. Your window sticker doesn't show an elite package? Does it have the upgrades speakers? Carmax has a few Mach1 worth checking out as well
This is showing a 12:1 compression ratio
https://media.ford.com/content/dam/fordmedia/North%20America/US/product/2022/mustang/2022-Mustang-Tech-Specs.pdf