Cam Bearings

On my J motor build i am noticing a slight tight spot on the intake cam in one small spot on rotation. Very slight drag, should it be addressed? The bearings are original to the 81 engine. My head machinist inspected them while installing the oversized valves and thought they looked good.

Measure the tolerance with plastigauge, if within tolerance all good. 
If tight the you can shim the cam cap using a shim cut from a soft drink can which is 100 micron thick. If you just shim one side then the cap will lift 50 micron if you do both then the cap will lift 100 microns. 
Retest with plastigauge to check the tolerance after each. 
If you leave it tight you risk oil starvation to that bearing. 

It's a simple solution to an otherwise difficult to resolve problem.

If it's no7 bearing I had exactly the same issue on my J motor.
Ive run shims on many engines to rectify your exact issue.