On the front of the upper intake manifold, there is a vacuum return line fitting. That your PCV return tube connected to. Plug that or you'll have a major vacuum leak. I just use a large black vacuum cap. I'd put a breather on the passenger side then, and plug the drivers. It'll be like stock then, except you have a vented pressure release instead of a draw-through. Mine is set up this way, with the stock valvecovers, and I have no problems whatsoever.
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'91 Mustang GT 5.0 AOD Daily Driver
Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI
13.73 at 103.8, ~2.2 60'
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