I bought a 1986 Supra Beast. It has a 460 ford inboard motor that has been marinized.

-replaced impeller
-replaced thermostat
-replaced regular water pump ($50)
-replaced hoses
-took heads off they were severly WARPED had machine place grind down installed all new gaskets was told this was likely the problem. IT WASNT!!!
-replaced all other water pumps (I believe raw water or sea water pump?)
-Place that has done all this work says WATER FLOW IS GOOD.

What the HECK could be next? I bought this boat for $1500, and for the first week it ran fine. NOW IT RUNS AT 220 OR HIGHER after over 4000k of labor and parts. Does anyone have any idea on what could be causing this? When i feel the hose that takes water into the motor, it is cool. When i touch the hoses that the water comes out of the engine they are HOT and you can barely touch. The big silver exhaust manifolds? are always too hot to even touch as well. Was told you should be able to rest your hand on those! Any help would be great. Thanks guys! ((((((((((