Noisy rocker arm?

Hey guys, I just got the 440 I rebuilt in my RamCharger running. I primed the oil system and I broke the engine in with some Lucas SAE 30 break-in oil, varying the rpm around 2k for about 15 minutes. I drained the break-in oil out and it looked great. Filled it back up with some VR1 10-30, primed the oil system again just to be safe, and started it up. While under the hood playing with the tune, with the engine at idle I can hear a metallic ticking/knocking sound coming from the passenger side of the engine. Thinking it was a defective lifter or flat cam lobe, I took the valve cover off and started it back up. The noise is louder with the cover off. All of the rocker arms appeared fine, all moving the same amount.
I can’t hear the noise at anything over 1500rpm because the exhaust is pretty loud.
The rocker arm assemblies are the factory stamped style. New push rods.
I’m really hoping it’s just a noisy rocker arm and not a rod bearing. But if it was a rod bearing, wouldn’t it sound the same on both sides of the engine? And be loudest at the oil pan?
Also, I let the engine idle for about 20 minutes while I was crawling around and listening to everywhere I could, feeling for exhaust leaks. The noise never got any louder. The oil pressure started at 75psi cold, then dropped to 40psi after sitting at 180° for 20 minutes.
I’m thinking about borrowing a rocker assembly off of my Duster and seeing if it goes away.
Have y’all had any experiences like this?

Here’s the link to more details on the build if you’re interested 440 for my RamCharger

Thanks, Craig.