I just finished rebuilding a 22r. It had a massive oil leak when driven at freeway speeds-- I'm assuming due excessive crankcase pressure. I had just bought the truck, when after driving it for an hour on the highway, it spun a bearing due to oil starvation. At the time, it didn't seem to leak when traveling below 50.

Now I've finished the rebuild, and it is overpressurizing the crankcase in a big way. Oil is laking from many of the freshly permatexed gaskets. Blowby is coming out of the fresh air breather. I have not changed the pcv yet, but it does rattle, and has been cleaned.

I'm really at a loss for what to do because I've just replaced all the rings, bearings, etc. and permatexed all seals, only to have oil piss out of every single seal.
I did a compression test and got 125 psi, which is lw for a 22r. Still, I'm pretty sure the rings have not completely seated yet. It doesn't seem to be burning oil, just leaking from excessive crankcase pressure. Thinking about maybe doing a leakdown test, or just blowing some compressed air into the cylinders. Wondering if it might be something stupid, like valve timing being slightly off. But it runs very well apart from the high crankcase pressure.

Any help would be great.