ROD HALL RETURNS TO BAJA WITH HISTORIC BRONCO   SPARKS (April 17) — SamCo Fabrication is a busy place these days with various off-road racing trucks being built or repaired. But owner Sam Cothrun and his staff are really thrashing to ready a historic Ford Bronco for an event in Baja California at the end of the month. It’s the same one that Reno resident Rod Hall and his co-driver Larry Minor won in 1969. At that time it was called the Mexican 1000 but now is the Baja 1000.   “This is the Bronco, we’ve verified that