Make sure the motor starts right away, less than 5 complete crankshaft revolutions, and runs at or above 1500 RPM for 30 minutes to break in the cam and lifters
Set the ignition timing while it is running and make sure it doesn't get to hot while breaking in the cam and lifters, I'll shut them off if they start to get hotter than 200F and let them cool down to 160F or less and then complete the break in time. Do that as many times as it takes
After the cam and lifters are broken in change the oil and filter and cut the filter open to look for debris in the pleats, all new motors make debris but it shouldn't be a bunch
I normally see debris in the oil filter up to 3 changes and then they stay clean, engine assembly is like brain surgery, it is absolutely impossible to keep it to clean. I try like hell to keep them as clean as I can, I found a eye lash in one filter a long time ago
I've have and use a clean room to assemble my motors since 1975.
Clean, clean, clean and clean them some more
Make sure to use a good high quality oil with zinc in it or a zinc additive to help protect the cam and lifters
What is the quality of the fuel you will use in this motor?