OK. Out of the 4 tanks I have I was able to get two straightened out. The first has the knee pad brackets but the badge pockets were filled in with bondo that I had to dig out. I was hoping the badge tabs were still there....they were. The inside was pretty rusty so I used Evaporust the clean it out. Then I used the POR15 process to seal it. It was the first time I had used it and it turned out pretty good. If you try it follow the directions to the letter. There was a big dent in the top that I had cut out and a patch re-welded. There is a lot of surface corrosion that would mean covering the whole tank with bondo to fix. I'm gonna skip it because it's just not worth the trouble. Any defects that come through the final finish will give the tank 'character'.
The second tank is in better shape rust wise and again the PO filled in the badge pockets and also removed the pad brackets (why do people do things like that). If I use it I'll use some double sticky tape on the knee pads to hold them on. I can probably get away with using the tank without sealing the inside. No surface rust.
The first tank has the outlet for the crossover pipe but my petcock does not. I'll just put a rubber nipple on it to block it. The second does not have a crossover pipe.
Now I just need a little warm weather to take the tanks outside to paint. I'll post the finished product soon.