You usually have to scrape the bearings to remove tight-spot distortions after install. Guys who rebuild these on a regular basis will modify an old cam to have a "cutters" carved into the cam journals, so as you install and rotate it, it will cut the proper bearing clearance. Careful work with a razor blade will shave down the high spots in the bearings that will show up shiny after a tight cam install. Scuff lightly with green Scotchbrite pad after shaving so you can see the next round of adjustments that will be necessary.
