I'm at work right now, but will get back to you guys in the next couple of days. Will replace the fuel line from remote needle valve to carb and check out the tanks for leaks, then replace the glow plugs with A3's. (One step at a time)
If that all looks okay, I'm gonna replace the tanks with smaller ones, and report back.

Pa Ben:
From your pictures, it looks like the fuel tank is lower than the carb. Got an idea about how much lower? If I remember correctly, the standard rule of thumb is: the centerline of the tank should be at the same level as the centerline of the carb's throttle barrel. If it is much lower, it can cause lean runs, especially if you pull high g maneuvers.