Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_91 (points INTEGER, year VARCHAR, class VARCHAR)

### Question ###
What is the smallest point amount for years prior to 1958 when the class is 350cc?

### Accurate SQL ###

SELECT MIN(points) FROM table_name_91 WHERE year < 1958 AND class = "350cc"