starting a engine thats been sitting for a few year...what to do

I got a great deal on a 360 thats been rebuilt and has around 15k on engine. It's been sitting for a long time in his garage and I'm wondering what precautions to take before trying to fire her up. One thing I know is just to pull distrubutor and prime the oil pump. The engine spins freely as well was thinking of maybe spraying the cylinders with some wd 40 in case there may be a little rust in cylinders.