Heavy Breather!
Don't know bought the engine as is, so I don't know a whole lot about it.
Crane 1.5 aluminum Roller rockers
I bought a used engine once. Fired it up and sounded good, but it had issues. It idled as rough as anything I ever had on the street, yet it would fall on its face after 4800 RPM.
The other issue was blowby. You couldn't stop it. I would pull to a stop light, and if I had to sit there very long, the pig would leak oil. So I would fix the leak. Then it would move to another spot and keep leaking.
I finally gave up, and pulled the engine to figure out what the cam was and look at the leaking pig. BTW, I did a compression test and it was fine.
What I found was a reground cam that was JUNK, and some dilhole had used a ridge reamer on the top of the bore and blew it almost .020 big. And th cylinders had .008 taper and I forget the out of round. All the top rings were broken, I assume from all the taper, especially at the top. Had to take it .040 to clean it up. Also installed a .509 cam that had a better idle and pulled to 6200.
Lesson learned.