Table schema:
CREATE TABLE table_name_68 (points VARCHAR, entrant VARCHAR, year VARCHAR, engine VARCHAR)

Question: 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"