Per post #3 it's a hydraulic flat tappet with Comp anti pump lifters and springs. Sounds like it was built by a previous owner so no cam specs.
Some are definitely louder than others, the valvetrain in my 340 with it's lunati 60404 is pretty loud too compared to more mild, slower ramped cams I've had in other sb mopars. But the noise is "new", so, something else may be going on.
