The stock intake should have a plug or two as well.
Do this:
Remove the upper intake, flip it upside down and then you will see the plug that I am talking about. Remove one and purchase a fitting for it (as describer earlier). You will probably need an allen wrench to remove it (if memeory serves correctly).
Don't look for an existing vacuum line to hook it up to. Unless you want to do some sort of T-fitting adapter. However, that will require splicing into existing lines - something I wouldn't want to mess with.
Good luck,
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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