According to the pilot, he was flying the airplane to a nearby airport for a maintenance inspection. On the downwind leg of the airport traffic pattern, the pilot received current wind information from a pilot on the ground. He then configured the airplane to land and flew a "normal approach." During landing, the main landing gear touched down just past the displaced threshold while the airplane was travelling at 77 knots. The airplane "bounced" and, while in the air, the pilot held the airplane at a "normal landing attitude." The airplane was then "hit by a gust of wind" from the left and the airplane veered to the left, departed the runway, and continued over grass. The nose landing gear impacted a mound of dirt and collapsed. The airplane traveled a few hundred feet past the mound and eventually came to rest in a nose down attitude. Postaccident examination of the airplane revealed substantial damage to the firewall and engine mounts. The pilot reported no preimpact mechanical malfunctions or anomalies with the airplane that could have precluded normal operation.