No discs that I am aware of, but you can swap the original huck brakes for the '51 and newer Bendix units (standard modern drum brakes). You would need everything from the drums to the backing plates, but add far as i know, it is a bolt-on upgrade.
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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