Jeff, Kraig - If you look at the tank you will see it's made in three similar sections. the center section IIRC has the filler neck plus 4 knotches stamped into the inside end which allows gas & air to move into & out of that end of the tank. The tank was originally soldered, brazing really won't work well. The tank I tried to repair had a crack about an inch from the threaded hole for the sediment bowl. I eventually got the crack brazed, no solder around the repair, but the heat of brazing weakened the solder joints, pressure testing the crack repair resulted in one section of the tank flying about 25 feet across my shop. After seeing the rust pits in the tank up close I have no desire to try to use that tank.
I built a tank for my #72, a larger capacity tank, almost 3 gallons, and sealed it with Eastwood's kit. I was not happy with the liner kit results, no leaks, but the stuff had runs & sags and looked bad. I bought a new gas tank, OEM Kohler, 2 gallon plastic, when they only cost $80.
I'd look for a used basket case lawn mower or garden tractor with a usable gas tank and buy it and part the rest out.