Although I didn't find a .025" Cometic gasket, they do carry a .027" MLS, which is pretty much as low as you an go without o-ringing the block.
Cometic C5769-027 has the compressed thickness along with a 4.2" bore to minimize gasket volume down to 4.77cc. The .047" quench is not great, but much improvement over what you probably have right now.
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