Joe - Do like Bill suggests: Remove the rocker box and check for stuck valves,disengaged pushrods, etc. It'll also be a good time to check/adjust the valve clearances.
Before starting the first time, pour a quart of oil over the rockers. Also remove the plugs squirt a few pumps from a squirt oiler (a tablespoon or two) into each cylinder. Then before replacing the plugs crank the engine until pressure just begins to show on the gage. This will insure all the internal parts are oiled before your first startup attempt.