Getting a 318 running?

I'm betting that motor is good to go. New gaskets is always recommended when an engine sets and you don't the history. I will say what I would definitely do is put a new rear main seal in it. The small block mopars usually have a small amount of oil that will drip from the back of the oil pan due to this. It's cheap, and can be installed by removing the rear main cap. That is all I would do besides the new gaskets needed to re-assemble.