Hmm, not really cow horse breeding.. Two Eyed Jack was an amazing AQHA Hall of Fame Halter horse but that's the only horse on the sire's side that jumps off of the page at me. The rest isn't that great on the sire's bloodlines.
The dam's is what worries me. Her bloodlines go to back Impressive, who is a horse that carried and passed on a genetic problem called Hyperkalemic Periodic Paralysis. There are a lot of threads around the forum on HYPP and you can search for more information on the web but it's not something to play with. Do you know if the mare was ever tested for HYPP? I'm not really familiar with the APHA bloodlines..Someone else can tell you more about their role on the dam's side. Horse HYPP Hyperkalemic Periodic Paralysis (HYPP) in Horses