[donw1986]

You can maintain the dual tanks, i did , there are 2 types of tank switching valves the earlier years it wont work not sure exactly what year they changed them but the valve in my 86 is rated for 65 psi, works fine, you will need to change the switch on dash to an 87, the 87s came with factory throttle body so the switch appears the same but keeps power running through it to power the fuel pump i installed a pump in each tank, when you flip the tank switch it reroutes the power to the punp on the tank you select