Engine 2001 Mustang GT 2 Valve 4.6 No Oil Pressure.

Hello guys! I’m new to the Stang Family! I just brought a 2001 Mustang Gt 2 valve, and the car had no oil pressure, the right head was clacking, and the timing chain was clacking too. So I went ahead with replacing the timing chains with the tensioners, and replaced the oil pump. I put the motor back together with new gaskets and oil . I started it up and she was purring so beautiful, oil pressure was great, I let the car idle for about 15 min I look inside at the gauge and have zero oil pressure. And the motor started to clack once again on the passenger side. What can I do?

I got some pieces of the broken timing guides, from inside the oil pan, I didnt remove the pan though. Even though I had full oil pressure? And it was lost all of a sudden?

Do you think it would be better to remove the oil and check it with one of those cameras ? Ive heard its a pain in the behind to remove the oil pan.