I really don't want to have to tear the whole front of the motor apart because the water pump was already new
You don`t want to but you should.
That`s the only way to stop that leak.
When I changed the timing set on my 340 the gasket kit had 2 front oil pan seals.
One that my builder used was leaking and looked to be the better of the seals, but I found a note saying the earlier engines used the lesser looking seal, which I used and it solved that front leak.