On the passenger side of the intake manifold I have an opening that is letting the exhaust gas come through.  Never noticed it until this leak started.  I know that this is the exhaust gas bypass but I have put ram horn headers on my engine and don't have the control valve on the exhaust.  I looked at the shop manual for my '60 F-100 but didn't see it mentioned.  Can I just plug this hole or what should I do with it?  Thanks in advance for any info you can give me.