You should be able to get the thermostat gasket sealing surface on the intake flat enough by using a large flat file that's nice and sharp.
As long as it hasn't sat on the bottom of a lake for an extended period of time it should clean up fairly quickly.
Cutting that surface on a mill and boring that groove for the thermostat to seat down at a machine shop will cost you more than simply finding another intake that's in better shape.
Dress it down with a flat file and get it done.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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