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WHY is the cam binding?
Remove the cam tower and check that the top surface of the cylinder heads are level. If you have one that is lower than the other, the cam tower will warp, causing the binding.
If your heads have been resurfaced, perhaps too much material was taken off, which could account for the difference in height. You can use a feeler gauge to measure how much one or more are off.
Next: Is the cam tower base flat? Same drill-straightedge and feeler gauge, there should be absoutely no clearance between one end and the other.
Probably what is happening is the cam tower is distorting as you torque everything down due to a high spot. If the cam didn't bind before, it's unlikely that a distortion SPECIFIC to the bore itself is the problem.
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