Tight 383 Cam Bearings

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Rusty hit the nail right on the head, Chrysler machined the front three cam journals first, the rear two were machined after from the rear so there can be some issues like you are experiencing this requires newly installed cam bearings to be "broached" like what Rusty explained in his post.
Rusty does indeed have knowledge most others do not.

If the problem is misalignment of the bores, the "grooved camshaft" trick is great. If the problem is a cocked insert, then you are simply compensating for a problem the installer created.
 
Problem solver:Return to machine shop that did the work ALSO bring camshaft you have and show them the issue and ask for them to fix what is wrong.
 
If you pull the cam out you will see marks in the bearings where it is tight and rubbing. you need to scrap the bearing at that spot very lightly and try the cam again. keep doing this till the cam spins nice.

Truth.
Happen to me when I finally got my block back from the machine shop.
Pull the cam back out , the bearing will show the tight spot ( shiny ) could be any one of them. Look them over good. Fix that spot a very little at a time until that cam spins NICE.
 
I went through this exact same thing last year with my 383 build. Use an old cam and make cuts in it, grease the cuts to capture shavings, and put the old cam in a turn to allow it to shave into the new bearings. It worked really well for me.
 
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