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aftermarket mechanical linkages? Not likely if you meen of the performance enhancing or extra stout construction. Your best bet is replacing your parts with new ones from LMC, or better yet getting a hydro setup.
If it's just the clutch pedal, the pedal pivot point is bushed somewhat poorly. You can disassemble that and re-bush it with wrecking yard parts (same bushing as most GM brake pedals similar vintage) or probably get bushings from LMC or somewhere.