The lineage for this Clark line up through John Clark comes from The English Ancestry of Joseph Clark (1613-1683) of Dedham and Medfield, Massachusetts, NEHGR, vol. 152 (1998): 3-23. p. 8.
This connection to a Henry Clark in Woodchurch, Kent (who married to a Mathilda Echingham of Echingham, Sussex), seems to be random, and not actually sourced. Could someone with a pre-1500 certification take a look and disconnect if appropriate?
Thanks for your help!