I just bought a 1967 250S from a widow. The husband had just bought it and it ran at the time. I know that he changed the fuel pump and it appears that he changed the plugs and wires. When I turn the key the engine just cranks. I checked that the fuel pump was working and gas is flowing. I also have sprayed starter fluid into the carbs and nothing happens. I found what I think may be the old plug wires in the trunk. I took some of the plugs off and put them back on just to make sure they are on ok. Every now and then the engine actually want to turn over, but thats about it. How can I check to make sure that their is spark for the engine to turn over?

Thanks for any help with this.