Cutting A833 Input Shaft Question

If anyone cares I’m using this clutch setup in the Roadrunner. I have this same kit in my wife’s 56 Chevy and they work great if someone is considering the hydraulic throw
out bearing 1966-70 B-BODY MOPAR -Plymouth Satellite Coronet Charger Plymouth GTX Road Runner – Hydraulic Master Cylinder Clutch Pedal Kit (Billet Reservoir) - MalWood USA