CREATE TABLE table_name_98 (date VARCHAR, test_debut VARCHAR, position VARCHAR, year VARCHAR)

What date has a Position of back, later than 1964, and a Test debut of 1st rl test v new zealand?
SELECT date FROM table_name_98 WHERE position = "back" AND year > 1964 AND test_debut = "1st rl test v new zealand"
SELECT "date" FROM "table_name_98" WHERE "1st rl test v new zealand" = "test_debut" AND "back" = "position" AND "year" > 1964