Big Pop-welcome to the Stovebolt Page. I am sure you will find this site extremely helpful as you go forward with your project. It you are refering to the clutch head screws, I do know that Chevy Duty carries a screwdriver assortment with the clutch head ends (
www.chevyduty.com). I am just finishing up my '56 restoration and have been able to get a lot of excellent information from this site.

Again, welcome aboard!