What chassis was used with the Chevrolet engine in 1991?
CREATE TABLE table_33406 (
    "Year" real,
    "Chassis" text,
    "Engine" text,
    "Start" text,
    "Finish" text,
    "Team" text
)
SELECT "Chassis" FROM table_33406 WHERE "Engine" = 'chevrolet' AND "Year" = '1991'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What chassis was used with the Chevrolet engine in 1991? ### Input: CREATE TABLE table_33406 (
    "Year" real,
    "Chassis" text,
    "Engine" text,
    "Start" text,
    "Finish" text,
    "Team" text
) ### Response: SELECT "Chassis" FROM table_33406 WHERE "Engine" = 'chevrolet' AND "Year" = '1991'