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Mike,
All of these posts are good. I had to change the core in my 69 once and never again. I would use Fred's idea first and be sure that one of the vacuum hoses that control the valve isn't off. Also make sure the valve is ok as on mine that isn't hard to change. Then If you have water to the valve and the valve is working, use Steve's (VRM) approach and see if you can get water through the core. But one thought. If the core is old and has never been changed, don't put to much pressure on it as they have a tendency to rust and if you bust a place in it, you won't get water through it but will have a floorboard full of water. All of the above mentioned ideas are good and I have used them to check mine. Good luck.
Ron
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