Water leaking out of lower unit

[taqwache]

I just purchased an 81 V20 with a 100hp evinrude. The motor is in good running condition but when I hooked up the hose to start it, there was leaking water from between the lower unit and main body. I removed the lower unit and disassembled the water pump and found a worn out impeller and bad water pump gasket. So I replaced everything, impeller, water pump housing, all seals and gaskets. everything went together perfect but once I started up the motor, it does the same thing. Is this normal? I plan on taking it out tomorrow in the Corpus Christi bay for a sea trial but not sure if something else is wrong. There is water coming out of the hose on top like its suppose to, but I don't know how much is normal.