The control valve is located inside the pump behind the fitting where the pressure hose is attached. There will be a spring and the control valve. The kit comes with a holding device and small shim washers. Usually about 3 washers will reduce the pressure to the correct amount. We have also installed a couple of Mustang II front ends and they also need to have the pump pressure on a GM pump reduced. Too much pressure can cause erratic operation and possible failure of the system. I don't know if a GM pump is any more reliable or better than a Toyota pump. It's probably cheaper and the availability of brackets
(for GM engines is better). The last kit I bought came from Bill's Hot Rod, should be online. I think Speedway also has them.
Fred
