Do you know what ASSUME(ASS U ME) means
Never assume any mass made after market automotive parts, especially race parts, are ever made dead nuts accurate
The timing set can be mismarked, I've seen that a lot with Cloyes timing sets for both BB and early Hemi and L.A. motors
The first custom ground solid roller cam I bought(Chrysler 392 hemi boat motors) was ground 8 degrees retarded
I installed it and use a degree wheel to check the cam timing at .020, it was off around 3 degrees so I assumed that was good enough, which of course wasn't
That bad cam did end up teaching me how to check the LSA the quick way and that helped me under stand a lot more about how camshafts work with hands on experiences