Rods and caps are numbered, as I'm sure you know, and numbers should face the camshaft side. Did you put a bit of oil on the bearings before installing..?? The rods caps and bolts are normally a pretty snug fit, so thinking it would be tough to be mis-aligned.

Is the cam and crankshaft timing mark(s) in proper alignment..?? Maybe try loosening the valve train assy., then see if the engine will turn over.

Was the crank turned, and machine shop supply the bearings, or bought in a kit..??