First time engine assembly

It sound like you have a machine shop rebuilt and assembled "Long Block"? Just need to add the remaining parts to it. A factory service manual of any year that covers the 440 will have the torque specs that you need. 1966-78.
I use RTV on the oil pan, water pump, timing cover gaskets. Valley pan, some people do, others don't use and added sealant there.
I sure other will chime in here with more help on your questions.