Thanks for the feedback folks.. on noodles, Mg, nuts, etc!
I did the first randonneur series (200k) and it went fairly well. Energy wise, not a problem, I had energy to spare at the end. I purposly never went anarobic and generally kept the heart rate under 150 with peaks about 165.
Nevertheless, I STILL %$%&* CRAMPED at about 95 miles. Had to take a 30 minute stop, clothes change and massage to keep going. I took it real easy until the next stop (105 miles) where I hydrated more, drank some tomato juice and ate some potato chips. Tomato juice has lots of sodium, more then a "V8" for example. The woman at the stop told me to drink tonic water which has "quinine" in it. She said she swore it would help cramps.. but she may have just been trying to sell some old tonic water! I actually took her up on it but don't know if it made a differenc. At any rate, no more cramps the last 20 miles.
I'm looking into buffered salt tablets.. supposedly the real crapola for combating cramps, I think salt is my basic problem.