The Oil Gusher

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Valve covers should be internally baffled and then you use grommets like these (http://static.speedwaymotors.com/RS/...L_166fac68.jpg) which allows things like your PCV and Breather to function properly.

If you use closed off grommets your not allowing your system to breathe properly. Grommets with the little flap are for valve covers which do not have internal baffles.

Threaded port behind carb on the intake manifold is a full vacuum port which can be used for anything that requires manifold vacuum like the distributor or shift modulator on a th350.