Engine building questions?????

I hope you oiled the sh*t out of the pistons and rings during assembly. That should be enough to keep the bores from rusting (they dont rust too bad in the car you drive do they?) Install a set of plugs, tape over the ports, and store the engine in a bag until you install it. If you are storing it outdoors or are really paranoid, you can get some slilca gel at a hobby shop (used for drying flowers) and put a pouch of that in the engine bag.

As for finding TDC, install the dist before the left valve cover goes on. OR, if you are going to wait until the engine is in the car before you install the dist, you can aalways put your finger in the sparkplug hole and bump the engine over withthe starter. It will be pretty obvious when you are the compression stroke.

As for the cam lube, where did it go? As long as there is a good film on the lobes and the lifter faces (it will get smeared pretty thin if you have turned the engine over by hand a couple times) you should be fine.

As for break-in, follow the cam manufacturers recommended procedure. As a rule, you want to keep the engine at a high idle (2000 rpm) for the first 20 mins of running, and avoid extended cranking. Use a non-synthetic oil with some zinc in it. I like Castrol GTX 10w30, some guys like the diesel oils. I think 15w40 is too heavy for a break-in oil, especially if you will be starting outside in the winter, but thats just me.