Truck wont start

[brandster]

Recently purchased a 72 truck and cant get it to start. When I bought the truck the PO said it would start but he didn't go through the ignition, I think he just touched some wires together to get it to crank. I never actually heard the truck crank up and run but guy said it would crank up. At the time I really didnt care if it cranked because I was going to replace the engine anyway and didnt plan on messing with it for a while.

I decided to just make it a weekend driver for the time being so I had a buddy come over to look at it and we were able to get it wired back to the ignition but when we go to crank it, the truck engine turns over but never sounds like it wants to start, the engine just keeps turning over. Based on the PO saying the engine cranks, is there anything else im missing that would keep the truck from cranking if all the plugs are good, has gas in it...etc?