I just went through this on my 53, used a 36" flex cable from Summit. Tried to jury rig a couple other ideas but the flex cable is great, smooth and no issues. I did use the 'spoon' type pedal, hard part was finding the best place to mount that. Best of luck

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed