76' Scout II, V8 345, won't start. Recent back surgery led me to have lad next door replace plugs, wires, distrib cap, condensor, rotor. There are 2 unconnected and , apparently unrelated wires. Since that it won't start. Turns over. Timing gun on wires shows no spark from coil. Battery is new. Electronic ignition. Where should I go next?? How do I check coil without removing? Appreciate any help for a novice.