Thanks for all of the replies. I took the advice and called the Atlanta guys and they can set me up with an aftermarket tank for about $250 and a lot of other stuff I'm going to need, too. I've ordered online from them but that was the first time I've ever called them, very pleasant and helpful and knew what they were talking about. I'm about a three hour drive from there so I'm probably just going to take a trip down there with a list of stuff I need. Making the trip and just getting the stuff is probably going to save me shipping costs and a heck of a lot of time in waiting for parts to come.

Cleaning that old tank is just too labor intensive and messy if there is an affordable alternative, and I don't know for sure what condition it's in under that varnish, or what damage I'll do to it filling it with chain, gravel, or nuts and bolts and rolling it around. Go with a new one and it's done and I shouldn't have to worry about it anymore.