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Below, you can see the the crack I have in the intake. I've checked over the rest of the manifold and don't see any other issues. The mating surfaces look square, and the gasket appears to have a complete seal around all the ports.
Despite the picture, I'm more convinced now than ever that it's actually a timing issue. After reassembly, I started cold with choke. Everything seemed normal. Warmed up the engine and it seemed to idle at 1000 RPM, but was a little rough. Checked the timing, it was at 0 degrees. Loosened the distributor and attempted an adjustment. As soon as I advanced at all, it jumped up to 20 deg and about 1600 RPM. I turned it back a little, and it jumped down to 0 deg and 1000 RPM. I fiddled for a long while, and there was simply no way to get it to stay between 0 and 20. So I picked a spot as close to center of those two as possible and retightened the distributor.
Now with the engine warm, when I first start it up, it idles at 1000 RPM. If I rev it at all and let it fall down, it falls to 1600 RPM and stays. If I stop and start the engine, it again idles at 1000 RPM.
Am I facing multiple issues here? The car seems to act differently every time I start it up, or tear down and reassemble the carbs and manifold.
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