Fuel Syst Overhaul...

I have used Right Stuff brake lines. They were fine.

But I don't think anyone makes a good replacement sender unit for A-bodies. Look at it beside your old one. You will see that the float arm is shorter and a different shape, and the pivot point of the arm is in a different location. Also, the little circuit board that the pointer runs on is also a different shape and size (it may be concealed inside a canister). This is because these firms are supplying a "generic" sending unit. It may read correctly at E and F (or can be adjusted to do so — that may take adding a resistor, or bending the arm) but in between it will not be remotely accurate, because it is not "programmed" to compensate for the fact that the upper half of the A-body fuel tank has a massive cut-out for the spare tire.

To read correctly, it would need to compensate for the fact that when the float is at the midpoint between bottom and top, there is only about 1/3 tank of fuel remaining. The original one did this by variably spacing the windings on the circuit board. Unfortunately, this is the part of the original that wears out and causes it to fail.

If you have a new tank and a new line, that should take care of your rust problems. But I went to great lengths to find a good original style sender, and refurbished it with a new float and new sock.