contact David Boyd here on the board, he makes and sells fuel tanks for the 63-72 crowd and he surely can or does make them for the 73-87 trucks, he can make one with the pump in the tank for FI trucks. It probably would help if you have measurements in hand of space between frame rails and length of the tank that would work for you. he has a special running right now for the 67-72 tanks, but I would ask him anyway.
http://67-72chevytrucks.com/vboard/s...362307&page=11