90 hp w/ low water pickup picked up sand...

[snookman265]

My 1984 Yami 90 hp w/ a Bob's Machine Shop nose cone sucked up sand and clogged the water jacket and motor overheated. Removed lower unit and head. Removed water jacket and flushed out all sand. Flushed out crankcase from water inlet tube that goes to water pump. Took apart water pump and flushed all out.
Installed new exhaust/cooling gaskets, head gasket, water pump housing, impeller, gaskets, plate, water pump base housing/oilseal housing.....
Now it won't draw water unless hose fed on start and as it warms up it starts to blow exhaust out of the water pickup in the nose cone. Overheats within minutes of start up. Have I blown it up?

Please Help.

[boats.net]

Put it in water and try it. If exhaust coming out pickup then water pump is not getting any water.