After checking for the proper push rod lenght with a push rod checker. I needed 7.500 rather than the 7.450 PR I had installed.
So after installing the correct ones along with Yella Terra roller rockers the sewing machine is about the same level of a stock LS6.
It is clear that the noise is coming from the injectors.

Bottom line is when changing cam and heads, be sure to get to Comp Cam Push Rod Checker to get the correct push rods.

Deno