user: Question: What is the latest year that has an engine of Cosworth V8, with a chassis of Hesketh 308E?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1974.0, 'Token Racing', 'Token RJ02', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT MAX("Year") FROM "Table" WHERE "Engine" = 'Cosworth V8' AND "Chassis" = 'Hesketh 308E';