It looks convoluted, but this is the water system return to the radiator. The hoses go from the left cylinder bank to the right radiator entrance and the right cylinder bank to the left radiator entrance. The left line had a copper tube that receives return water from the carb jacket.
We also soldered the lower water pump elbows.
And hooked up the water tube.
All these fittings need gaskets, something I plan to make next time I'm at the shop. Till then...