So I am following up on a recent post where I have been breaking in a recent rebuild of an FE 390 engine that has been smoking just out of the driver's side exhaust after about 300 miles. No. 7 and 8 spark plugs were showing oil on their threads but the compression is pretty equal while testing 5-8. Tonight I removed the aluminum intake and was hoping that the gasket failed but it looks like it was working properly. When I look into the ports for 7 and 8 they are not oily. Just dry carbon in them like all of the others. I'm sadly thinking that the head now needs to be removed and taken back to the shop that was supposed to have replaced the valve seals. Is this problem something that they should have taken care of when they were in for a general clean up re surfacing and the seals replaced or would they have not known of this problem? The placement of the headers on this 68 Fairlane make taking the head back off most annoying. I just wanted to ask you good folks if from what I'm telling you does it sound like a problem with the valves or am I not looking at this properly and could it still be the intake gasket. I'm not a professional mechanic so your help would be greatly appreciated before I go to the trouble of taking this engine further apart.