I use those manifolds all the time. If your remote water pump has two exit lines then you just run one line to each block. For the hot water return to the radiator you can either buy a radiator that has two inlets (AN#12 or AN#16) or you can use a Y fitting.

AN lines work or you can use tube fittings and then regular rubber water lines. Either works just fine, the AN stuff looks cooler and costs a ton more, but the rubber water lines work just fine.