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Can sway bar presence and size help to ID an original BB car vs a SB carr? How?
BB cars had a different tach, caps instead of straps fastening the rear half shafts, larger front sway bar, rear sway bar, wider radiator, and a different hood.
You'd need to look up the redline for the particular year/engine. Many people don't swap the tach, a hassle taking the dash apart.
No guarantee, maybe a bit more evidence. All parts can be installed if someone built a BB clone. Is originality important to you? Numbers? If not, does it matter what it started life as? Would 'correct' work for you?