Intake gasket issue

I am using Edelbrock Performer 5.0 manifold on '93 standard stroke block & RPM heads #60259. Cam is Compcam XE276HR.
I am having a major problem with oil in the upper manifold. Disconnected all the vacuum/pcv connections and fitted breather hoses from the rocker covers to the air box. Oil still a problem.
I removed upper & checked that no oil sneaking through the blocked off EGR port in top of the lower.
Removed the lower #3821 - and behold there is large amounts of oil on the bottom edge of the intake gasket Felpro 1250 in each port. You can see where the oil is sneaking past the bottom of the gasket.
It appears that the gasket is not sealing along the bottom edge.
So it appears the faces of lower are not sitting flat on the faces of the heads.
How can I measure where and how much gap?
How do I overcome this without pulling engine out and remachining the faces?

Richie

Yes I cleaned all the oil out of the upper and removedthe pcv hoses. The air box showed no sign of oil coming from breather hoses attached to front of rocker covers. No oil from airbox to throttle plate.
But intake side of throttle plate onwards was wet wet wet and oil accumulating in the bottom of the upper.
As I said it looks like oil seeps around bottom of gasket into the intake ports. The gaskets were well stuck to the head faces and had not moved.
The bottoms of the gaskets matched up with the head ports. There is no gap into the valley.
When at high throttle around 5000rpm there wont be much vacuum and hence no problem. However when you back off the throttle suddenly the engine is still trying to suck air. With the throttle plate closed it will suck air from any weak point - in this case the valley. So this oil is sucked up into the intake at the gasket. With the overlap this cam has, is it possible that it sends the oil back up through the manifold into the upper?
Cam is Compcam XE276HR - duration in 276 ex 282 / duration at .050 in 224 ex 230 / valve lift in and ex 0.544 LSA 112 / intake centreline 108.
I suppose another source of oil could be through the rocker studs if they were not sealed - not the case.
I will dummy up install of lower and try to work out if not sealing at bottom edge of gasket - how I don't know.
More thoughts?

Richie

Appears problem found - the 1250 gaskets did crush up properly when tensioned. However the Print O Seal does not appear to have sealed. It is flattened, but oil still got past it. When I pulled the manifold of the blue seal had not adhered to the manifold face.
Is it OK to to place a bead of sealer on both sides of the 1250 - if so which is best - I was going to use ThreeBond (black).
Also I have cleaned surfaces with MEK.

Also I am thinking of doing away with PCV - reduce any chance of oil in manifold.
I have fitted AN12 hoses to front of valve covers & fitted the other ends to top of the airbox.
Is this sufficient or do I still need PCV. If I do, Am I better off blocking the one in lower manifold an running an inline one ( 1979 Toyota Corolla) from the hose fitting on the oil filler tube.

Richie.