Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_70 (chassis VARCHAR, engine VARCHAR, year VARCHAR)
### Question:
What chassis was used with the Chevrolet engine in 1991?
### Answer:
SELECT chassis FROM table_name_70 WHERE engine = "chevrolet" AND year = 1991