Be careful when installing the oil pump. The oring that seals the pump to block passage is really easy to have knock out of the little stakes that hold it in place. Also make sure the front crank seal lip doesn't roll over when you install it.
Make sure the silicone that seals the pump housing to the block doesn't touch the oring faces when you go to install. The oring groove needs to be clean and dry, and block needs to be clean and dry, with a clean and dry oring.
When mating the pump to the block, keep an eye on the oring with a flashlight, make sure silicone doesn't touch the oring when initially mating, and that it stays in the groove. Take it apart and clean everything if silicone does touch, and retry. Its OK for silicone to touch the edges of the oring when you bolt the pump down and it squeezes out when torquing, but that initial point of contact needs to be straight rubber oring to aluminum, no silicone!
I've seen oil leaks from silicone on top of the oring, basically creating a double gasket where it doesn't need to be.