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You'll have to do a little searching, but I know GM sells an EGR delete plate that looks just like the end of your EGR tube that fits into the top of the intake. Sorry I don't know the part number, but I'm sure a little looking will turn it up.
just pick up one of those rubber expanding freeze plugs from your local parts store. If I remember correctly the size you need is 1 1/8", but I would verify that by measuring the opening.
You'll have to do a little searching, but I know GM sells an EGR delete plate that looks just like the end of your EGR tube that fits into the top of the intake. Sorry I don't know the part number, but I'm sure a little looking will turn it up.