Not sure why you want to advance your cam another 4° when the custom ground cams usually have the 4° advance ground into them at the start compared to a stock cam.
Try timing it straight up, Cam at 12:00 o'clock and the Crank Gear at 12:00 at TDC. Then your distributor is ready to drop in to fire at #1 at this position.
Then see where your numbers come out. 112 Lobe Centers ???
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No easy task figuring it out first time out of the gate. Then if you add more advance than it was originally ground for it complicates it even more.
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