My factory tank had a lot of rust in it, and over the course of driving it a couple years before tearing the car down it had sprung several small pin hole leaks that I patched with gas tank patch kits from auto parts stores. This was only a temp band-aid so I got this new gas tank from Rock Auto for the rebuild. Their price spanked everyone else. A g-body forum member warned me after he saw that's where I bought it from that he had bought two of these wagon tanks from them and neither fit. I found this was the case with mine too, the filler tube wasn't even close. Luckily sheet metal flexes easily, and a few careful tugs and test fits on it, it lined up fine. I then pulled it back out, installed my sending unit and it was good to go back in. The factory fuel line was pretty rusty, so I custom fabricated the fuel line using a roll of 3/8" aluminum tubing from Summit and mounted it with some insulated clamps. The line was carefully routed away from exhaust in the front and rear, something of a problem with the factory line and a lowered car with headers.
Finally the car was ready to fire up for the first time. I didn't let it run long as there was plenty more to do, but it was pretty exciting to hear it run after 8 months and a complete disassembly.
First 406 start-up
Not long later I had all fluids filled, the carb adjusted, and the car running great. At this point I was running out of time to get ready to move across the country very quickly. The car was crazy loud inside and I wanted at least some degree of creature comfort for the drive so I addressed the interior, sort of.