First startup issues

Pull the intermediatre shaft.
Roll the motor to TDC for CYLINDER 1.
It's easy to confuse since there are 4 other marks on the balancer.
turn it till it blows your finger out of the no 1 spark plug hole.
That's cyl1!

The install the intermediate shaft with the slot in the top pointing to the number 1 cylinder intake bolt hole, or the intake bolt on the drivers side in front. It should point at that. If you meet those conditions, throw in the dizzy and you should be able to tweak it to run right. That's how you time it properly.

I assume you know the rest.

OIl pressure...ahem...that could be anything. Is the pump mounted flush with the cap?
Plugs in the block missing? Too much clearance? primed good?

And fishy is right, that plug is left out with people jsut plugging the back wall which is really the plug you use to get to the galley plug...THAT NEEDS TO BE PLUGGED. If it's this plug that's left out you wont have any external leaks. It will leak back into the pan since it's not outside the block, it's through the rear wall, through one plug hole and then into the galley.