The MEL cooling system is unique. You might want to study it. The passages on the EDEL should be sufficient for the engine. There have been a few installed and I have heard no complaints. You might want to compare a stock intake manifold gasket to the passages and see if they are about the same size.
I would be more worried about the block thermostats hanging and the divertor valves rusting out (behind water pump).
As for engine color, I am not sure. I have seen red, silver and gold colors on MERC rocker covers. I am pretty sure your rocker covers and air cleaner are red.
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