For me, Looking at that stuff I would post most of it on Cragslist. There is a lot there that a machinist or welder would like to get a hold of. I have sold many items that way and you will get more selling as is. Ask your local scrap yard on how much they pay for their metal there may even be an ad in the classifieds of your newspaper. then take the pieces and weigh them to get a ball park figure on how much you will get for scrap and then mark it up to make a good profit, you can always haggle with a potential customer but don't go under the scrap price.

Good luck.