One of the machine shops I use to use in Orange County, CA would hone out the out of round and undersize cam journals in my blocks to factory size. I had ask him about align honing them and he said he couldn't do to them all being different I.D.
I ended up buying the tool set needed to install cam bearings in my shop and I install the rear cam bearing first and slide the cam in, if it rotates freely I repeat until all five of them are in. I have had more than block that the new cam bearing wouldn't allow the cam to spin properly do to being to tight and I had to scrape those bearings with a bearing knife repeatedly removing the high spots until it rotates freely
It sounds like your block is one of those needing custom fitted bearings or fixing the block cam journal I.D. :
Let us know what you find this time and decide to do to fix it