Rear Drum Brake Help

Bewy said
OK. So what 'body' would a 63-64 Plym Belvedere 4 door sedan be, 119" WB? Or 63-64 Dodge?

The Plymouths in '63-4 were all B-bodies. The Dodge 880 series in '63-4 were C-bodies. The rest (330, 440, Polara's) were B-bodies.