'67 Barracuda Fastback S 383 4 speed rear end issue?

Turns out that my issue was 100% caused by the clutch pedal spring attachment point interacting with the parking brake bracket. It took quite a bit of messing around, but once I got the clutch pedal moving completely freely, it drives like a different car. Not a fan of how much side-to-side play there is in the pedal mechanism and I expect I will be messing with it regularly unless/until I replace it or rebuild it. Anyone have experience with that? Are there suitable replacements available and/or can they be successfully rebuilt?