Solid Roller camshaft selection those of you running a 408 race application - lobe seperation

Since you’ve found weak cylinder pressure on half your engine, I myself would try the old cam out straight up without any advance and see how it behaves to establish a new baseline. The only way I can see a cam needing to be advanced in a four inch stroke LA is if it’s too large (I’m pretty certain that’s not the case!) and the car is under geared with too tight of a converter.