I think perhaps he's not asking about the gap, but about the configuration of the joint between the scuttle and the windshield frame, and whether there should be a ridge (silver car) or no ridge (red car). I don't know what the ridge is, maybe a weld fillet. The other photos suggest most cars don't have such a pronounced ridge. So perhaps the silver car had a new fender welded in. I guess the ridge is of no consequence as long as the chrome fits over it.