383 new rebuilt starting issue

So I just ran my engine again, not for too long, and it definitely sounded better than the last time but it sounds like there is a lot of top end noise. I ran it for around a minute again and there was nothing new in the oil but the sound didn’t really go away. I’m tempted to try running it longer to see if the valve train just needs time to oil up but I also don’t want to damage my engine. Any suggestions?