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John --
If that plug is popping out, it almost certainly means you have positive pressure in the crankcase.
A way to check this is with the "jiggle" test. Loosen the oil filler cap, but leave it sitting in place with the engine idling. If you have positive pressure, the cap will jounce and bounce and jiggle around from the idling engine. But if you have appropriate crankcase vacuum, the cap will be pulled down and won't jiggle.
If you still have positive crankcase pressure, it probably means you've missed the small vacuum hose (easy to do, I did on my '86). The flame trap housing has a third small vacuum line that frequently plugs rock-hard solid. Replace it. Also check the fitting in the intake manifold the hose connects to -- it often plugs, and must be reamed out.
A good trick is to fasten a strap across the plug. On either side of the hole is a bolthole -- 6mm, I think -- used to mount the distributor when that engine is installed in a 700. You can fabricate a strap across the plug secured at each end by bolts (I did exactly this). IPD now sells an adapter for this.
But be aware that if you have crankcase pressure, you run the risk of additional problems. Engine seals and gaskets may be seeping, and on rare occasions you can pop a seal out of its housing. A popped rear main seal is a much bigger headache than that plug.
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