Honestly I would not polish it and leave it slightly rough. I might even go so far as to take a small cuttoff wheel and a dremel and purposely carve ridges in it. The reason behind that is so it will help atomize any raw fuel droplets that might try to collect and run down the bore of the spacer. I often add the same grooves on the intake manifold ports for the last 2 inches of each. Liquid fuel does not burn, vapor burns.
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