89 5.0 Cam Sprocket Stuck

hi.
I don't really know how this website works but I hope some of you know how an 89 cam sprocket is supposed to work. my buddy wanted me to look at his motor before he put it in his car. got there and it was extremely difficult to turn over with a wrench on crank bolt. took it home and stated to tear it down even got new rings after researching the ones that he had were very unreliable. took timing chain off and it spun fine. apparently the cam sprocket is rubbing/binding on the retainer. I don't know what brand the sprocket is. I know it is an e303 cam and brand new block and retainer. please help
 
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