valve cover smoke

I picked up a used but rebuilt 390 recently, done .90 over with c3ae6090c heads, hv oil pump, performer intake, stock cam. After running it that way for a while without any problems, I installed a hydraulic roller cam that i had pulled out from my previous 390, so I know it worked well and I...

I just rebuilt the 390fe in my torino after it had about 80k miles on it. It was my first time doing a complete rebuild, but everything went smoothly. Engine started fine, cam break in went fine, and it drives great and strong and sounds good. Problem is that it smokes a lot through the valve...