I just got done reinstalling my 351w back into my 69 XR7. Everything electrical works fine accept the low fuel light will not turn off even with the key out. Tried disconnecting the reconnecting the battery but nothing works. Everything is a stock setup in my car. The gas tank is full!
If I remember right you should check the wires to your starter relay. You have a wire on the battery side, so it always has power and needs to be on the other teminal. That is if I remember correctly.