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The best way is to leave it on the tank and install another tank. Just a opinion....
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There's a good chance the tank has pin holes on the bottom anyway. I hardly ever saw a Corvette tank that didn't have an inch or so of water in the bottom.
I had to replace the tank in my '68 and still have it (with the sticker attached) stored above my garage. The car is long gone but much of the stuff I replaced is still around. BTW, Anyone need a complete smog pump and brackets for a '68 427 Corvette?