I'd be pulling the crank to check for other damage, that looks like it copped a fair whacking.
I dont know if your flywheel will seat properly on such a munted surface? was there anything special about the crank? or just a standard job?
might be worth relpacing just to be sure.
basically as per orangelj, you could try machine the flywheel true but good luck getting it to mate on that crank with no run out. ive thrown out flywheels and crank's no where near as bad as that.
