If it's leaking on the inlet side check VERY carefully the oil pressure switch, seen a few failures recently, this normaly is pointing directly upwards, but if your is pointing slightly forward, then will soak massively the whole side of the block, and leave puddles of oil everywhere, it leaks between the metal outer part and the plastic centre part that has the terminal in the centre.
How tight did you torque down the hg ?.
tabetha