How much crankcase oil is typicall in a 1st gen with the larger '84 & up oil cooler?

Also, if the Tokico installation instructions boldly state not to use an impact wrench on the strut top nut but the shaft spins when you try to tighten it and you can't get a wrench on the flats on the shaft up in the camber plates how the heck are you supposed to torque it?

TIA