Table schema:
CREATE TABLE table_name_75 (runs INTEGER, year VARCHAR, match VARCHAR, venue VARCHAR)

Question: Which Runs is the highest one that has a Match larger than 63, and a Venue of national stadium, karachi, and a Year smaller than 1996?
SQL: SELECT MAX(runs) FROM table_name_75 WHERE match > 63 AND venue = "national stadium, karachi" AND year < 1996