Why cars such as the Triumph TR6 and MG MGB so slow compared to other cars like the '67 Shelby?

Arent Triumphs and MGs handbuilt sports cars? Also, is the Shelby more expensive? or:Aren't Triumphs and MGs handbuilt sports cars? Also, is the Shelb

Aren't Triumphs and MGs handbuilt sports cars? Also, is the Shelby more expensive?

or:Aren't Triumphs and MGs handbuilt sports cars? Also, is the Shelby more expensive?

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