Tony if you are getting that much oil sitting on top the valve it HAS to be getting in there after shut-down. To do that it has to be draining from somewhere such as a spring seat or rocker lubing bolt hole. The intake face is to far above the lifter valley to be leaking into the port after shut-down. Pull the distributor and prime the engine with a drill. Take an old oil can and pump oil into the spring pocket on top the head with the rockers backed off to see if its a spring seat. If it is you can epoxy a hardened spring shim in place. Just some thoughts on what it may be.