Just scrub it after sandblasting then spray n season
Gas valves are half the port size of full port ball valves-
Most can only find galvanized or zinc conduit nuts and used them . I used zinc- I heard vinegar reduces or removes zinc coating but I don't know for sure. All my other hardware is stainless except for the pipe nipples were raw. Only side effects I've seen is an extra 46 lbs of BBQ Belly.