Congratulations on your 100 pounds lost! I am also a big loser, having lost 68 pounds (from a high of 235 to my current 167).
Although I didn't have a stomach staple, I try to eat as if I did have one: lots of small, high-carbo, low-fat meals.
You don't have to forget carbo loading. Just keep eating carbos (and little else) throughout the 2-3 days prior to a marathon. BTW, current evidence points to the strong possibility that most of carbo loading is psychological. I personally do it all the time, not just before a marathon.
More important in keeping energy up during a marathon is input of calories through (a) eating a light breakfast a couple hours before the marathon, (b) drinking Gatorade or the like during the marathon, and (c) taking nutrition gels (I prefer ClifShot) during the marathon. Everyone, but especially you with your special situation, should practice all of the above during long training runs. In my case, I try to re-create marathon conditions for every long run of 18 miles or longer by eating breakfast and carrying Gatorade and ClifShot gels with me on the run or setting up the run so that these things are available along the way. If you do this, you'll soon find out if you're capable of a marathon. I think you are.
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