Thanks everyone. I thought oxyacetylene may be a better choice here, but I was not sure. The crack is small and it is not structurally critical but I want to repair it for cosmetic reasons, even though you can only see it with the hood open.
The car was built in October 1965; registered as a '66 when it was first sold. It is an MG Midget. Not exactly a hotrod, but you know those yappy little mutts that think they're big dogs? Same thing here.