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I have a twin Mercury engine Outrage 18 and I got rid of that manifold as unnecessary. The Mercury/Quicksilver water separating fuel filter (now the model for most after market brands also) has two outlets and with more than adequate fuel flow for two engines, so the manifold is not necessary.

My guess is that the old Whaler design was based on a predominance of OMC and Yamaha powered boats, whose fuel filters of the day only had one outlet, so two filters were needed for twins, hence the need for the manifold.

When I installed replacement 3/8" A-1 class holse from the tank, I ran it directly to the filter under the gunwales (with a 90 degree inlet to the filter), and then a fuel line to each engine comes out of the filter. It works well with twin 115's or 90's.