I'm new around here, and I'm not a professional mechanic or even a very experienced shade tree mechanic either so take what I have to say for what it's worth.
I have an 84 CJ7 that did the same thing! I know I'll catch a lot of flack for this but it has a Chevy 350 that was bored 30 over. In my case it was time for a rebuild because oil was getting past one or more of the pistons. The way I understand it, you should not have enough pressure at the breather to force oil out unless something like this is occuring. Someone please confirm or dispute what I'm saying. Good luck, I hate to see someone get frustrated to the point of quiting. I can relate, but you would probably just stumble into another Money Pit like I keep doing
