Yes, the early E-heads had issues in that area. We ended up sleeving those two inner holes and the center outside hole with thin wall SS tubing glued in. Then I machined the top of the 10 bolt holes for step washers. That took care of it. It is a fair amount of work. You have some easier options to try first. I would put a radiator pressure tester on the system with the valve cover off and try to verify the exact leak point. If it's just that one stud, remove it as mentioned, and put some sealer on it and re-torque. I like Permatex aviation form a gasket for this job. Sticky liquid non-hardening sealer. If you don't like that, pipe sealant with teflon is a decent alternative. If you PM me, I can send you a couple cartridges of a miracle sealer you put in the radiator. It is not commercially available, only to radiator shops. It is an amazing sealer. Finally, I would reduce your radiator cap to a 7 PSI cap if your car doesn't run over 210. That will take a little of that failure point.
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