F body pans are getting kind of hard to find and can also be pricey. If your truck isn't slammed on the ground, the GM muscle car pan should work and is the most reasonably priced. You get everything from pan, windage tray to dipstick for about $150. It may hang down below the crossmember a half inch or so depending on what mounts you use, but again, if you aren't slammed on the ground it should be fine.
http://www.ebay.com/itm/Oil-Pan-Kit-...a9bd5a&vxp=mtr
On a side note, DO NOT forget to knock out the little plug in the block where the dipstick goes before you put the new oil pan on, or you will be pulling the pan again. The plug needs to be knocked out from the bottom.