That engine may work, but there are most cost effective options with iron heads. You will need to check compatibility with what parts you plan to reuse. Of critical importance would be the intake, for instance, the stock mercruiser intake does not bolt to Vortec heads. I'm not familiar with the heads on that summit engine, so I can't say your Merc manifold woul fit. Could upgrade intake as well? All Merc alpha drives have a water pump impeller on them, I've never heard of bypassing one. The engine still requires a water pump to circulate water in the block.
