Both blocks would be ok to use. If the one with the broken motor mount ear is standard bore or close, it would be my first choice. To repair the ear I would Tig weld it with an Everdur rod ( silicon bronze ). If welded correctly, it will last forever. '92 blocks are becomming harder to find. They're around but people are reluctant to part with them. A rarely known piece of interest about '92 engines; they are lighter than Chevy rat motors.