NL500: 88 blind defense on 642K3r - he be 3barreling me!

[Janis N.]

NL500, 100BB stacks, 5-handed.

Hero is BB with 8[img]/images/graemlins/heart.gif[/img]8[img]/images/graemlins/club.gif[/img]. CO is 17/14/5 multitabler over 138 hands with 27% att. to steal and 85% cbet flop. Hero is 20/16/2.4 that session, fairly straightforward TAG.

No other reads, I don't recall any of us being out of line recently.

1 fold, CO raises to $17.50, 2 folds, Hero calls.

Flop 6[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] ($37.50)

Hero checks, CO bets $28, Hero calls.

Turn K[img]/images/graemlins/spade.gif[/img] ($93.50)

Hero checks, CO bets $72, Hero calls.

River 3[img]/images/graemlins/diamond.gif[/img] ($237.50)

Hero checks, CO bets $200, Hero...?

What % you call and what % you fold here? Do you play earlier streets differently?