1991 Ford Bronco engine

Engine Mechanical problem
1991 Ford Bronco V8 Four Wheel Drive Automatic

i pulled the engine out to drill out broken oil pan bolt.then i replaced oil pump an the pan an gasket..then reinstalled the engine..now the engine wont turn over at all..it was running before this.i did have it on a stand upside down...would that have something to do with it..it was a complete engine,when turned upside down..ive taken the plugs out,then tryed to turn the crank with a socket and a braker bar,wont budge...