Call with a set on a 4 straight board?

[Karak567]

Villain is 35/15, bad and very aggressive. Aggression factor of 4.5 and this is over 300 hands.

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($400.15)
MP ($73.30)
CO ($245.40)
Button ($603.78)
Hero ($198)
BB ($200)

Preflop: Hero is SB with 7[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $1.
<font color="#666666">3 folds</font>, Button calls $2, <font color="#CC3333">Hero (poster) raises to $9</font>, <font color="#666666">1 fold</font>, Button calls $8.

Flop: ($22) 5[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, Button calls $20.

Turn: ($62) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $50</font>, Hero calls $50.

River: ($162) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

hero checks, villain had the auto-bet pot button checked, hero calls all in

[Phyreball]

I probably do the same here, I have problems laying down a set. I think he has two pair, lower set enough for this to be +EV.