Managed to get the tank off the bike as well as get the lock open with a new key from the locksmith. The cap was pretty corroded and I managed to take it apart and grease it all up. The inside of the tank seems to be decently rusted and the petcock filter is gone. Im going to try to clean the tank somehow (maybe vinegar/coke and powerwashing it.) then Im gonna reseal the inside. Might be more cost effective than another used tank.
I managed to drain the fuel and it was a terrible dark color. I ended up with two gallons of this stuff
As for draining the carbs, the bowls were filled with green fuel, either from the brass oxidation or maybe a fuel stabilizer. Im hoping to get the airbox and carbs out tomorrow and tear into those in the next coming days