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Unless you are extremely confident of your RTV application skills, I'd say dropping the oil pan to check for RTV debris is going to be more important than break-in oil, esp after a rebuild.
But to the original question, I used 0W-20 full synthetic. Changed oil within 1500 miles, and then again around 4000 miles, and then every 5500-6000 miles. Mobil 1 0W-20, sometimes 5W-30.
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