360 LA getting oil in #3 cylinder.

And do these tabs need to be snipped off the head gasket where the intake mounts? Or leave them to hold intake gasket in place?

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Been a while for me but I never snipped those off. After mounting the head, the side intake gasket may rest on them when you are positioning it. But I believe I always folded that tab down into the china rail gasket (if using) before intake install. Same if using RTV on china rail. If you have insufficient clearance on the china rail, then those tabs would have to go.