CREATE TABLE table_name_68 (points VARCHAR(255), entrant VARCHAR(255), year VARCHAR(255), engine VARCHAR(255))
How many points were there in a year earlier than 1977, a Cosworth V8 engine, and an entry from HB Bewaking alarm systems?
    
SQL: SELECT points FROM table_name_68 WHERE year < 1977 AND engine = "cosworth v8" AND entrant = "hb bewaking alarm systems"