I have a 77sf18 that I'm gradually restoring. I did the fuel tank 2 yrs. ago and found the same undersized tank that you did. I looked locally for a fabricator on cape, but settled on Speedy Tanks in NJ. I gave them the measurements and they had a custom built aluminum tank on my doorstep in about a week. I don't recall the exact dimensions, but I think I went from 35 gallons to 43. Because the extra capacity is forward it should improve your COG I believe, at least when full. I do agree with Sidelock's comment however, that you probably don't need a lot more range on an inshore boat with efficient power.
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