nutsinho, this is 309BB deep, not 150BB. Did you also notice that villain shoved only $2290 eff into $1720 and not $2790 into $1720?
I don't think the overbet is big enough to make a very significant difference in this hand and I don't see why he couln't represent 77. We are just fortunate to know that he doesn't have it.
Or is it somehow obvious that shoving 77 on the river is absurd?