An easy CAP with my boat?

[Stealthy]

Vilain is 36/6.5/2.6 after just 100 hands. He does donk a lot of streets but has not played the maniac by any means.

Party Poker 3/6 Hold'em (6 max, 4 handed) converter

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, BB calls, UTG calls.

Flop: (6.33 SB) 8[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, Hero calls, BB calls.

Turn: (4.66 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, UTG calls $8 (All-In), <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, BB calls.

River: (14 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, Hero?

Well he can't think I have an 8 given my pre-flop raise, and certainly not the boat but he is showing no signs that he wants to slow down. An easy CAP or am I looking at an over full to the 8s here enough to make calling the 3 bet better?