Make sure you put the hole between a pair of cylinders so there isn't a valve under it. Ideally you should have a baffle (on both sides). I use these:
They're made for Chevies, fit in a 1 1/8" hole. The problem with them is the hole in the center of them is too big for a PCV valve; I find a grommet that fits a PCV (or breather) and has a long enough shank so that it will fit down in the Mr. Gasket #5425 baffle. The OD of the grommet doesn't matter, as I sand it down on the belt sander so that it fits snuggly in the baffle.
DSC Motorsports (and others) sell a plate that fits over the hole in the intake the rear breather goes over with different holes or no hole. You could buy one of those to cover the rear hole in your manifold and it would look factory. You could also drill a hole the correct size to fit your breather and sandwich it between the manifold and breather if you choose.
Sorry your wife doesn't have a sense of humor.
Dan