Are you sure the car was an LB9 car to start off, and not an L69? They did still have carb'd F-bodies in '87. Have you found the electric harness running to the tank? If it's only a single wire back there, it was carb'd originally. The EFI cars have a 3-wire connector at the tank (gauge sender, power for f/p, and ground).
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Originally Posted by //<86TA>\\
if the car is to stay carbed, the tank needs to be removed, whatever pump setup is in there needs to be removed and bypassed. After that, a mechanical pump will be fine, so long as the fuel lines are well insulated, especially if the mechanical pump has no return line. Or keep the ghetto electric pump and ditch the mechanical pump, but you still should have a return line.
You should also look into what happened to the fuel hardlines. They should be on the driverside, they are not visible in the pics, so where are they? Hopefully there is not 15' of rubber hose running under the car.
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Just to continue this thought, the easiest way to bypass an OEM in-tank pump would be to get a new tank sending unit for an '84 F-body with L69 (carb motor). It'll just have a pickup tube with a screen and a new float for the gauge.