If the intake is off you can use another method
just crank the engine over to TDC #1, on compression
Then go to #6 cylinder. Lay a straight edge over the tops of the lifters, leaning against the pushrods. Then gently hand-crank the the engine over,usually backwards, until the straightedge is touching the lifters on 4 points, two on each lifter; outboard-inboard-inboard-outboard. Then continue a few degrees in reverse. Then go back again and take up the chain slack in the normal direction, and stop when the edges line up again.. That is split overlap.
Now go read the timing marks, It should be within 4 or at most 5 degrees of before TDC. The Ica number establishes the split overlap. When you install the cam according to the camcard, you are establishing the Split overlap, pure and simple. But it is just more accurate using the camcard than the method I suggested. But on a stocker, accuracy is not that big a deal, as long as it falls between zero and 4 or 5 degrees of TDC on the advance side, it will run just fine. With a stretched chain, it may not fall into the range.
