I've only seen one 194 block and never thought of sonic checking it, but that's what would tell you a lot about its potential. The block definitely could be filled to increase cylinder wall stiffness if they are on the thin side. Being a shorter deck block than a 292, that in itself could add block rigidity. Sounds like a fun project, the 194 blocks don't have 1/2" head bolts like the 250/292 if my memory serves me right. So that could be one of the first upgrades that might be planned.....
