Getting a 318 running?

My goal is to get my 318 running. I was gonna rebuild it but after talking to a mechanic today, he told me that I probably didn't even need a rebuild that he's gotten a lot of motors to run, he had one filled with mud and got that sucker working. He told me to get this motor running, use it for as long as possible and save up and put something sweet in the car, that mopar was known for there big blocks, so build yourself a nice big block.

Right now the motor is out of car and on a stand. It isn't seized because when it was in the car I could turn it by hand. He told me to pull the pan look for metal shavings and the condition of the oil. Pull the valve covers, and maybe the heads, that I can maybe put a gasket set on it and get it running pretty good.

Anybody done this before? Don't know if I have to go as far as to buy a gasket set but that's why I'm asking!

Motor info: 1970 318 from a dart. The car sat for 10 years, when I got It most of it was there except the intake manifold was on poorly so there was like spider webs and stuff in there when I removed the manifold and no carb.