Electric water pump diy

The meziere water pump for Mopar LA looks very close to the Chevy model. The LA uses a flat plate over the existing timing case and just bolts up over that using the existing long water pump bolts. If you can make a plate (I did for my incomplete pump) to cover the original LA water pump cavity and them make the appropriate holes to match the chevy output, then you should be functional. IIRC this setup on a poly 318 used a chevy pump
mopar-318-poly-coolant-manifold.jpg
mopar-318-poly-coolant-manifold.jpg