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Thanks, Al and 'sastanley', for your helpful responses.
I disconnected the water inlet hose so now have about an inch between the block and the manifold; still not enough for useful photos. The three studs broke off within where they thread into the engine block. At two of them, the 'inside' half of the stud is still there; on one, I can probe all the way through the threaded hole. Next step is to remove the manifold for a closer look; probably drilling out and tappingfor the 1/2" to 3/8" threaded inserts is needed.
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