Overheating 360 new engine

Update 10/20/22. I have installed the fans, got the right coolant mixture in the engine and also drilled a hole in the thermostat. Still overheats. So someone in this thread had mentioned something about steam holes in the head gasket. After getting the engine to 180 deg I have found that the driver side head is getting much hotter than the passenger side . 50-100 degree difference. After further diag I’ve narrowed it down to cylinder 3 and 5 . Ironically #5 is the cylinder that the freeze plug blew out of. I have two car shows I’m going to in the first part of November. After that I’m going to start by removing the driver side head to inspect the gasket to block surface for any blocked holes by the gasket . Any advice is appreciated. Thanks to all for the ongoing help. I will update this again after I remove the head or heads . To give you an idea how hot it gets my msd box is mounted on the driver inner fender and the temp on the outside of the box was 152f The master cylinder was 165f . I did many temp readings at the same spots on each head as well.