What do you mean by "over/under"? You should just have one that goes between the block and the pump (as far as I can remember)
I thought that my leak was due to the pump seal, I was so happy to find out it was a bad clamp on the thermostat hose!
The small stuff is always such a pain sometimes, but that is where you make your money. What I mean is that it really counts. I hate working on my car b.c I waste more time out of paranoia then anything. I mustve fitted the timing belt five to seven times before putting tension on it.
One of the best things I did was pulled the radiator shroud so I could get a better look at the crank marks. Im sure youre using a new belt..............the marks are on them which makes life so much easier, when do this.
With the pump, Im sure you know to use an 1/8 silicone bead on the gasket /both sides when reinstalling. Make sure you trace around the bolt holes so you dont cause yourself any headaches with leaking fluid. If you had the block cleaned then you wouldnt have to worry about this, but make sure there is no residue on the block from the old gasket, you want it clean enough to eat off of.
Just some friendly advice
