Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the Wins which has a Class of 350cc, and a Year smaller than 1973?

### Inputs:
table_name: table, columns: ['Year', 'Class', 'Team', 'Points', 'Wins']

### Response:
SELECT SUM Wins FROM table WHERE Class = 350cc AND Year < 1973