The oil line could even be the problem? In the rebuild process how was it cleaned? Does it have a kink in it where it comes out of the block and bends upward? I've seen oil lines that looked like they had a lot of crud in them. I got new lines as part of my rebuild. I'll see if I can find a picture of a suspicious line partially coated with crud, and post it.
You could even have a pump issue where a gasket might be missing. I think Gene has commented on the importance of the oil pump gaskets?
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_2150_zpsc460dea7.jpg)
Here is a link to some posts on oil lines
Oil Line Good luck, Mike