You picked up a nice draw on the turn, so calling here is definitely +EV. I think it's a good disguised draw too, since he'll probably put you on a heart draw. This way, when you hit an offsuit king, you can probably run him through for a good bet on the river.

I don't know if I agree with the preflop play though, unless the cutoff, button, and both blinds are tight, non-agressive players.