My 1989 mustang 5.0 has a ticking / tapping noise that's coming from the motor. I had the lifters replaced a month ago . The ticking does increase with my rpm. Here's a video of it
Sooo, pull the valve covers off an see if they are loose, maybe they were not adjusted correctly, you could probably reuse your vc gaskets since just done recently.
Got good oil pressure?
Is it a single tap'n or is it like multiple tapping ?