[davebwell]

I think calling the raise is better than re-raising the river. There is no reason to put villian on a straight. You can account for three 6's and a 7 making the 8 high straight unlikely. On 6th street, you are showing two pair another player bet into you with a clear high hand involving a board pair of jacks ; indicating a) he has 6s up beat or b) he is very bad at this game. On the river he already called a bet from you, again indicating he can beat 6's up.

Given these factor I don't think the high or low are good. I think the river re-raise may have made your high hand good by convincing a better high hand that you hit a boat but I wouldn't count on that happening enough to make this a justifiable manouver.