I'm assuming your working on a 426 hemi motor so if so try degreeing the #6 intake and exhaust, they will be 360 crankshaft degrees different , same numbers, as cylinder #1 Both pistons are at TDC on both strokes, intake compared to compression, power and exhaust
A freind and fellow NHRA SS racer and engine builder, now deceased , always plotted every lobe in five degree increments to make sure every lobe was exactly the same, he sent many cams back IHTHs