Neutral safety switch or starter?

[1970stringbean]

Okay so I overhauled my engine over the winter. Had everything hooked up and ready to adjust the valves today and ran into a problem. I got the engine to fire and idle while we started to adjust the valves when the engine quit. Went back to start it up again and nothing. Let it sit for 30 mins and it cranked a couple times then nothing again. So I’m just trying to figure out what is wrong. Could it be the neutral safety switch or some components in the steering column. Or something to do with the starter? Any help would be great!