I'm not sure what shape they're in, but you could just wire brush it and weld up the drop rail in spots and then grind it to make it look right. Or you could, and this was done long ago before bondo, just as good but a little more expensive and very few people can do it these days, is they melt like iron or some metal(don't remember) as a body filler. Have a body shop do that for you. If you called a good reputable shop, they'd know what I'm talking about. It was done all the time back in the day but since the invention of bondo, it's cheaper and easier, but the method of melting metal on is still a cool technique.