rainflood car motor.3.0 taurus.HELP

HI I have a 1999 Ford Taurus it was in a flood had the oil changed but it has a tik tik tik...constant...what causes this ?any suggestions for oil or treatment???1999 ford taurus 3.0 24 vlave ???do i replace bottom end or top ..what is making noise .
thanks in advance to all

There can be so many problems with your car. Thats why insurance companies dont fix them. The water gets into everything. Where is the tick commin form?