What is the most number of letters that can be fit into a three by three grid of words, such that no letter...

Games magazine ran a contest on this.  The winner had 62:

                proxying|   buckwash  |   veldt
                ------------------------------------
                stumbled|      j      |  zincography
                ------------------------------------
                whack   | providently |   bumfs

Here are some good tries:

                backsword |thumpingly |   fez
                ----------------------------------
                vexingly  |      q    | throwbacks = 61
                ----------------------------------
                thump     | beadworks |   jingly

                backsword | thumpingly|  vex
                ----------------------------------
                vexingly  |      q    | throwbacks = 60
                ----------------------------------
                thump     |  bedrocks |   flying

                subjack   |downrightly|    fez
                ----------------------------------
                novelwright|     q    |  backups   = 59
                ---------------------------------- 
                pyx       |  subface  | downright

                krafts    | exhuming  | blowzy
                ----------+-----------+-----------
                phylum    |     j     | transfixed = 56
                ----------+-----------+-----------
                vexing    | folkways  | chump

                klutz     | cymograph |   fend
                ----------+-----------+-----------
                exscind   |     j     | kymograph = 54
                ----------+-----------+-----------
                myograph  |flunked    |   vibs
****
Unless noted otherwise, all words occur in Webster's Third New International
Dictionary, Merriam-Webster, Springfield, MA, 1961.