I am planning to drop the engine in my boat later this afternoon an was just thinking about the water routing. I have imco powerflow’s and wanted to pre heat the water prior to entering the block, problem I see is the lack of bungs/ports. Is it a real necessity to pre heat the water? I am now thinking of running the water in through the water pump ports. Out the t stat housing and into the bottom of the exhaust manifold. Would this be correct ? Thanks in advance for any tips.