does anyone know if rod bearings in a 91 22re that has never been cracked open will be standard bearings? becauuse they not stamped STD.

 

It's possible. The problem is that over a couple hundred thousand miles the surface of the crank might have worn down. Bearings aren't that expensive. Grab a set of standard, then plastigauge them. If the specs aren't right, buy new bearings that will fit more appropriately.