Have two converters I used with my old 540cid, hp was around 700.
One low stall (stalled @ 4400) and one medium stall (stalled @4900). The low stall has 23 passes and the medium has 12 passes. Both have been flush and sealed and in new cond. Brand new $750, asking $425 for each and can bring to any Ram race.
http://www.transmission-specialties.com/catalog/index.php?cPath=24 