Engine building questions?????

Hey guys I have a 318 that am building. I have it just about done. The distributer, intake, carb and valve covers need to be installed. I have a few question for your seasoned builders.

I am worried about rust build up in the cylinders and I have the heads on. Is spraying WD40 in the cylinders Ok and would it be enough to deter rust?

How do I find the exact TDC of cylinder 1 to install the distributer.

I installed the cam about a month and a half ago. Now all the cam lube is just about off. Should I add more cam lube? I still need to work on the trans before I can reinstall the motor.

What's the proper breakin procedure for a new cam? What oil weights are recommended?