Rebuilt magnum 360 Noise

I definitely agree with you. Thats what I'm going to do. But the pan is getting dropped anyway to inspect the bearings. The first day it ran it had a but of a noise at idle. Its since gone away but I'm just checking anyway. Definitely gonna try to eliminate an exhuast leak though
If you think you might have bearing issues another check you can do prior to tearing the motor apart is cutting the oil filter apart and doing an inspection. If you find bearing material in the filter that would be another piece of information in your quest to find this noise.