[ZeGermanHam]

With a 17-3/4" radiator core height, that certainly explains why your non-A/C shroud does not cover the entire radiator. Your radiator is considerably taller than would would normally come in a non-A/C car. The radiator height should be 15-1/2". But since you have a taller radiator installed already, I bet there is a way that you can get the 17-1/2" A/C shroud to fit. You might have to drill some holes in the shroud, but that's easy.

Maybe others here have additional info to the contrary, but I can't think of a reason why the larger shroud wouldn't fit with the larger radiator that you have.