I think Engert's run of 491 is the confirmed record on a 9-footer. Eufemia's run has never been officially confirmed, the same goes with Cranfield's runs. As far as I know, the main criteria of having a run confirmed officially is that there is a certain number of spectators who have witnessed the whole run from start to finish. I heard no one saw the Eufemia's run completely, but don't know if this is the case.
There are plenty of threads on straight pool high runs here.