I would double check a couple of things...
Valve cover seal...it may not be it, but check...feel the back of the head, closest to the firewall...if you feel any
oil, you may have a leak.
Broken rocker arm....crazy, but it will cause overpressure because the valve is not opening, and start forcing the
oil out in odd spots of least resistance.
Oil Pan seal...make sure it is good...it may just need to be tightened.
After that, you get into some of the major mechanicals and or rear seal issues.
Sorry about the leak. :-(