user: Question: What engine had a JBW chassis in 1960?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1957.0, 'J B Naylor', 'Cooper T43 F2', 'Climax Straight-4', 0.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Chassis" = 'JBW' AND "Year" = 1960.0;