I have not heard much talk about what people put between the body and the hinge when they attach it, but presumably some kind of silicone sealant before they either bolt or weld the hinge to the cowl.
Is yours going to be bolted, or welded?
Or is it actually attached right now? That's too big of a gap to my eye. Seems like it's seriously tweaked, if it's actually attached. If it's just sitting there, then it might be ok after it's fully attached.
Paul