With absolutely no offense intended, have you ever drove, even rode in, a 500 horsepower street vehicle?
I have two, with approximately 435~450 horsepower each, and in both, first gear is virtually worthless; AND both have positive traction rear ends.
One was built for advertising purposes (dual quads); the other because when I started the build, I was significantly younger, and a lot more foolish

Unless you plan on putting the truck on a flatbed, and hauling it behind another truck (with maybe only 300 or so horsepower

); give it some hard thought, and try to find a friend that has a 300 or so HP truck of that vintage that will give you a ride.
My nickel (2 cents with inflation!).
Jon.