[swamp rat]

Did the new fuel tank come with a new sending unit/pickup tube? so it has a new filter sock on it? I would also test the fuel pump, hook a length of hose to it and route it to a containor, have someone turn the enging and see that fuel is squirting out. Also, if there is no filter between the tank and carb its possible you have crap in the carb restructing fuel.

Per electrical, excess heat creates resistance, if the plug wires are next to the manafold they could be getting hot..