As I understand it Fred, those need to be blocked off especially if you are using the lifters that sorta look like an hour glass. I think I remember hearing that if you're using shell lifters then a problem is less or not likely. The others would bleed off too much
oil. George or someone will likely answer soon with solid answers, but I think I'm close.
By the way Fred, I am very sorry to hear about this. Is he going to get you squared away soon?