Adams, I am very sorry to hear about this. I know how much trouble you've gone to to maintain the originality of your car. All I can recommend is what you would do anyway, get a VERY capable shop involved to evaluate the true extent of the damage. Proper paint blending should really help if they only repair that area, but even if a full repaint is required, I don't see it having a huge impact on the value of the car.
Besides, it's not like you would ever sell it anyway, right? Does it matter THAT much how much the kids get for it when they eventually have to sell?
The advice above regarding the tank, ZF and other fragile areas is very good.
Best of luck with it.
Mark
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