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I'm with you tbirdtbird. A clogged block will in my experience cause an overheating problem. A long time ago I had a Fiat X19 that exploded and caught fire. After repair it kept overheating. It was rubber that went into the water jackets that restricted the water flow through the engine. Had to steam it all out and then it cooled perfect.
With the design of the A engine I would think any restriction of water flow could cause an overheating problem including using too much silicone to install the head. Actually I believe there was a thread recently on the Barn that said they had an overheating issue because someone used too much sealant when installing the head.