multi-way big draw, little fold equity

[teamdonkey]

0.50/1 6 max, 6 handed

UTG ($114.05)
CO ($130.27)
Hero ($276.48)
BB ($23.52)

Dealt to hero on the button - 3[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img]

UTG raises to 3, 1 fold, CO calls, hero calls, 1 fold, BB calls

Flop ($12.50) 5[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/heart.gif[/img]

UTG bets 5, CO min raises to 10, hero... ?

UTG is 42/3/1, i'm fairly sure he's got a good overpair. CO is 46/10/3.

I have no problem shoveling money in here, but without a lot of fold equity i'm not sure if calling is better.