Many years ago we did a 52 Suburban with a Lincoln IRS which required taking a 2 gallon notch off the top rear of the factory tank. This cut it down to 16g so we mounted a 10g reserve tank on the drivers side with an electric fuel pump and a line over to the main tank. If the main tank was allowed to get to 1/4 or lower the reserve could not overflow the main tank. An IRS center section mounts rigid to the frame so the driveshaft does not move other than spinning so everything like exhaust, lines, wires etc can be very close to the driveshaft which was necessary in this install. Been working for at least 10 years.
