The record of 7-3 had the largest attendance of what?
CREATE TABLE "schedule" (
  "game" real,
  "date" text,
  "opponent" text,
  "result" text,
  "vikings_points" real,
  "opponents" real,
  "record" text,
  "attendance" real
);
SELECT MAX("attendance") FROM "schedule" WHERE "record"='7-3';