None of the current crop of break-in oils that I'm aware of are any good. Best to use a premium street oil. The VR-1 Silver Bottle would be my preferred, but you could use a number of others... Chevron Supreme comes to mind - 10W-30 at Costco. I've had good luck breaking in GM motors on that
Many will say to put a can of GM EOS in the first batch of oil. If it's handy, maybe... But, likely it will fight with the oils built-in add pak ...
The big deal is to dump that first oil and change filter at 500 miles. Cut the filter open and see what you got?
Run a magnetic drain plug. If you have any concerns with this engine builder, run a BIG magnet on the outside of the pan bottom near the drain plug. On the first OCI, put a dowel in there with grease on it and see what you get? The magnetic drain plug will likely have shown you what's happening...
If you get shavings or bits of metal - stop and call your engine builder. Something is wrong and it needs to be on their dime... A little silver flash in the oil is normal at startup/break-in ...
Any bigger bits go through the oil pump, they will take their toll on that pump sooner than later ...
Do you have the oil filter by-pass blocked so that 100% of the oil goes through the filter at all times?
Run the biggest WIX filter (Napa Gold same) that you can fit. The additional media area reduces filter back pressure, easier to pump through